Hey. I'm (22M) I wanted to ask starting advice from reddit because I can't afford therapy and I can't really talk to anyone about this problem. 

I feel nervous every time I basically have to go somewhere where I interact with people (School, hobbies, work and even walking out my dog) I also get butterflies in my stomach. I just have a feeling of what if I screw up or say or do something wrong. I also overthink alot and think of my past screw-ups and mistakes I said or done.