I don't know what to do about all these scary and upsetting thoughts in my head
Why do you have these thoughts?
I don't know, they just don't go away by themselves, but I've found I'm able to deal with them by doing something else
Distractions won't solve your problems. Avoiding things by getting a hobby or something only makes it worse. You should talk to therapist or someone who experience dealing with these issues.
I don't think talking to a therapist will help. There're too many things to distract me that I can use to cope.
Your internal psychological processes are complex and deep and distractions from the internal surface tensions in your mind are only going to mask things over. Seek a counselor to help you get to the root causes here.