This won't be popular on HN, but my job is to speak the truth and eat the downvotes if necessary. :)
First, the truth is that God loves you and doesn't want you to end your life. I don't know what you believe, but I am firmly convinced that that is the truth. And being so, it overrides everything else in life. No matter how bad things seem, no matter how bad things actually are, this life is not all there is, and if we wash our sins away and live faithfully, we will inherit eternal life. Not only does that give us hope for the distant future and in the next life, but it gives us hope here and now, today, because God loves us and wants what's best for us. Note, this is not a prosperity gospel--what God wants most is for us to be faithful, and so he does not promise us an easy life, material wealth, or even good health. But he does promise to give us what we need.
Secondly, from a worldly perspective, there are people who have overcome much worse circumstances than you are in right now, to achieve their dreams, prosperity, success, or just plain happiness. So there is empirical evidence that you have hope for the future.
Thirdly, try to take a step back from yourself and your current feelings. Try to recognize that how you feel right now is not necessarily how things actually are. We humans are funny creatures, and our minds can run away from us, leading us down dark, hypothetical paths that may bear no relation to reality.
I don't know more than what you have said, so it might be that you have felt this way every day for a long time, or it might be that you have good days and bad days. Either way, you may feel differently later today, tomorrow, next week, etc. Sometimes a good night's sleep is all I need to snap out of a blue mood I find myself in when I get tired and stressed. It used to be that I would spiral further down and down, but sometimes now I recognize that I'm not being rational, that I am tired or hungry or stressed, and that I'll probably feel differently tomorrow--and I usually do.
So it might be that, at this particular moment, you are at an acutely low place, but it might be just a few hours until you're at a more even place. Don't be too hard on yourself. Give yourself some time. Take care of yourself. Eat a good meal, go to bed early (like, several hours early, give yourself plenty of time to get extra sleep), and give yourself the best chance at tomorrow.
One of the easiest patterns to fall into when depressed is to focus on oneself. It's really easy to do this when you're alone. It may help to envision the future life you would like to have, the future family you would like to have, etc, and think of yourself as preparing to live that life, preparing to serve those people. That means that you need to take care of yourself now so you can take care of others in the future. You have many years ahead of you and can do much good in the world. You can make many others' lives better with your time, body, and mind. Think of yourself as a potential force for good in the world, and consider yourself in training to serve.
Finally, if you have gone so far as to make plans for ending your life, you are at the point that you need help immediately. I don't know anything of Germany's social systems, but I'm sure there is a hotline or something like it that you could call or reach out to for help. Stop what you're doing and make that call right now. You owe it to yourself and those whom you will serve in the future to save your life now. It won't be easy, but it's the right thing to do, and you are strong enough to do it. I know you are, because you've already reached out here. Don't think about it, don't rationalize about it, just do it. All the other stuff can wait and can come in time. Take care of yourself now. Take a step back and consider yourself a friend in need of your help, and do what you would do for a beloved friend.
Here is some information I found for Germany. Please go here and reach out to one of them now: http://www.suicide.org/hotlines/international/germany-suicid...
I hope some of this is encouraging to you. I will be praying for you. Let me know if you'd like to talk privately out-of-band, and I'll be happy to correspond via email, etc.