I hate that my autism dragging me down all the time

I was working at a grocery store, but I just had an interview with a company that I really wished working for. So being so confident that I nailed the interview, and right after that I became so excited that I will land a job pretty soon I contacted my current employer to bring the hours down to half time. They immediately fired me. (Can't get any unemployment benefits from it) Now I am a month away starting a new job and I keep blaming myself about being so cocky and lost my income a month worth. I feel so pathetic and 2nd round interview is still there; so no guarantee that I will get that job(no competitors btw; I did the cold handshake) so I made one of the stupidest move once again! How to deal with this unstoppable self-hatred? And how can I improve not to make this shitty mistakes again?(got into a lot of troubles since childhood because of it)