I’m feeling depressed and hopeless and need help?!?

I’m at a point where I feel like I’m not good at anything and life is hopeless for me.

1. I’m currently pulling a C- and a C+ out of two classes. The C- comes from AP Calc AB and the C+ from Honors Physics. I’m worried that with those grades, colleges will send me a letter saying that they take back my acceptance.

2. I am not very close to anyone because I moved here during the summer before junior year. I have lots of friends, but no very close ones. I am also a strong introvert and I think I’m on the autism spectrum because when I was younger, doctors knew that something was wrong when all the kids were on the slides while I was looking at math flash cards.

3. I am a musician that auditioned for districts (basically for the county) and got a mediocre score. A lot of people thought I was really going to get in, but I got a stupid score that wasn’t even close to the score to get in. Seeing as this was my only chance to audition before high school, it especially sucks that I’m the only senior that auditioned and 1) didn’t get in and 2) didn’t get an All State recommendation.

4. Relating to the last point, I auditioned for the school’s musical. There were 4 violins, 2 violists (one was me), and 2 cellos. I thought I did really well and thought I was going to get in because someone said everyone gets in. Apparently, everyone but me and a cello got in and I was deeply depressed.

I just need help because I’m worried this could lead to me going insane, or worse, ending my life