Last night I happened to watch a 'philosophical video' called "How to Be a Happy Loser | A Guide for Modern Day Untouchables" [0] that turned about pretty interesting. One of the things it discusses is that sometimes the situation you're in is partly due to bad luck. So although it's good to take some responsibility for your life, it's not really fair to blame yourself for all of it. There are a lot of other interesting video's on the channel, I would definitively check a couple of them out.

Keep in mind that one thing you have is persistence (you keep trying everyday, and you tried exercising many times).

[0] https://www.youtube.com/watch?v=LEPUX4eMUSw