I agree about being scared after high school. I had my first attack when I was 17. I spent the two years prior crying a lot, I was cutting myself, felt like no one ever would love me... I was a mess. The ages of 15 and 16 were horrible for me. When I finally started to get happier and calmer, it hit me. I was in the hospital and told I had low blood pressure but looking back now, I think it was just a panic attack that made it drop. They can do some scary things.

Anyways, my point being is that small fears can add up and can make you just be completely torn apart. Feeling like you are changing is depersonalization. Do a google on it. It is common with people who have anxiety problems. You aren't going crazy. Your body is trying to calm down by making "reality" seem less real. If that makes sense.