Why can’t I make decisions?

I’m a 20 year old dude who graduated highschool 2 years ago and is finishing up my associates at community college. It’s time for me to make a big career decision whether to just go to work, get my bachelors degree, join the military, etc. I cannot decide. I can’t make a decision on anything. Part of me wants to go to school part doesn’t, part of me wants to join the military. I can’t decide and I feel like I have trouble making decisions on anything in my life.

How do I get better at making big and small decisions?