I'm a loser and I want to change that - now

I don't care what you want to call it; "depression", "desperation", "determination". All I can tell you is that if you are convinced (not "worried"; we all worry sometimes) that you're a "loser" or that this is your "last chance" to do something meaningful, that's not normal. If you were a friend of mine, I'd be hassling you to find a professional you could trust to work that stuff out.

Hey, either way: best of luck to you. Your career will be fine.

This question reminds me of another interesting post I came across Quora. Must be worth reading - https://www.quora.com/Life-Advice/I-am-in-my-late-20s-and-fe...

There is no such thing as 'losers' and 'winners.' Life is not actually a competition, despite what the marketplace and Western culture want you to believe. Every single one of us dies - we all lose in the end.

Don't pile the stakes so high. The more pressure there is, the more stressed you will be, and the less likely you are to succeed. Just do your best and hopefully things will work out.

For whatever reason, some things will come easy and some won't; that does not mean you should avoid the ones that don't come easy; they are often a signal to you of some foundational skill you need, or an underlying concept you haven't really grasped yet. Don't avoid that stuff to focus on the easy things; that's like oiling the wheel that doesn't squeak.

If you want it, keep poking at it, keep circling back around and picking it up again; get familiar and comfortable with your questions, confusions, problems, and then they'll melt away.