I never really post on HN (even though I should) and saw this post and had to respond.
First, if you ARE VERY SERIOUS about suicide, please seek help as others have mentioned. I suspect you're simply very sad and venting, but please don't do anything rash.
Next, please listen to/watch this: http://www.youtube.com/watch?v=sTJ7AzBIJoI
And then this: http://www.youtube.com/watch?v=zlfKdbWwruY
Perspective is the first thing you lose when you're depressed and when you're under 25, it's so easy to do. Don't put so much pressure on yourself, you took some chances, it didn't work out, life is far from over. Let me say I envy you. That's right, ENVY. You've learned at 20, what I learned at 31. You are VERY ahead of the game, and have SOOO many options because you have youth on your side and the pain today will guarantee your 20s are more productive & fruitful than they would have been had you not gone through this experience.
The most important thing you can do at this time is seek advice from someone you trust and respect, and begin taking baby steps. Don't try to tackle your whole life at once, just 1-step at a time. Surround yourself with supportive people, and strip the negativity out of your life at this time. Friends that kick you when you're down are either not real, or immature. They are useless to you at this time in your life, so stay away from them. Be honest with your parents, and tell them you need their emotional support to help you through this time. Parents make mistakes, and ultimately their emotions often get the best of them when they see you struggle, because they 'knew better'. It's important to share your feelings with them, and make them understand that you WANT to change your life and need them to support your attempts at doing so. It's such a critical step.
To share a personal story...
I graduated high school at 16. Yes, 16, and I was #9 in my graduating class. I then proceeded to FAIL out of college because I couldn't take care of myself and wasn't responsible enough to handle the freedom that comes with college. Going from 'bright all your life' to 'college failure' was an absolute low point. Suicide was contemplated frequently. The disappointment on my parents' faces was always there. Trying to get back into a different college was actually VERY difficult, because many colleges require transfer students to have a good academic standing from your previous institution, so talk about a perpetual kick in the groin. During this time, I had 2 choices. Use my brain & determination to figure a way out, or quit on life. I chose the latter.
I enrolled in the only college for 2-classes that would accept me as a part-time student for one semester, while holding down some b.s. job. It was depressing and embarrassing. The next semester, I used my 2-class semester creds. to give me 'good academic standing' and was able to apply to a better university for part-time status. During this semester, I took classes at both colleges (25 miles apart) with a 1-hr gap between my classes to allow for travel time. (That commute sucked) Exactly 1-year after getting kicked out of my university, I took my 2-semesters worth of transcripts and petitioned to get re-accepted into the uni. that kicked me out; my petition was approved, with conditions. I was placed on academic probation, and had 60 hours of 1.1/4.0 cumulative GPA at the time. I had burned through all my electives and was a Math/CS major, meaning the next 50-60 hours of class were purely CORE classes, no electives. I needed to have a 2.0 cumulative to graduate, meaning the hardest classes I had in front of me, required a 3.2 GPA average. The college I was attending was among the top 5 in engineering in the country, so turning my scholastic life around was pretty unlikely. I talked with the Dean of my college and started regularly presenting him my progress, to show I was committed.
For 2 years, I was on academic probation and thankfully had established some critical relationships to help me during this period in time. By the time I had enough credits to graduate, I was only able to average a 2.9 GPA during the rest of my time and did NOT achieve my 2.0 cumulative. I was not allowed to. My efforts to be transparent however, paid off. The Dean chose to extend a privilege to me having witnessed such a tremendous turnaround. The official name of this privilege was 'Forgiveness'. Every class I had failed I had to retake, but at this uni. grades were averaged, not replaced. 'Forgiveness' basically meant that the Dean could start wiping away F's from my transcript until my cum. GPA reached a 2.0 to graduate. It was the most ridiculous thing I had never heard of, but I some how managed to graduate from the university I previously failed out of.
It was only after this time, that I truly began to understand the value of hard work and smart thinking. You are smarter than you give yourself credit for. Surround yourself with positive energy, take baby steps, and create a plan for what you're going to try to do each week. Set realistic goals, like 'Apply to 20 jobs', as opposed to 'get a job'. You will make it through this, and please share your progress on HN. Let the community be your support system and see your progress, because your experience will help the next person that experiences similar hardships.
Good luck. Really. And if it gets too hard, watch those videos again or find other stories from successful people that never attended college. There's no set path to life. You can do this.