Right now, you're scared of the wrong things. Maybe it's rejection, maybe it's losing, maybe it's lack of stability or open vulnerability.
I get it.
I get scared too.
As a matter of fact, it's my physical body that reminds me of my fear. My forearms will swell up and carpal tunnel will sweep in, my intestines will flex and I'll vomit. Sometimes I'm not only afraid, I'm terrified. However, I want you to know something. You can channel your fear into energy that will build and not destroy. I remember in high school, somebody picked me up and threw me against the locker. He was a big dude and I was...me. But I remember I told myself, "Someday, I'll be his boss or he'll respond to an employment opportunity and I'll have his resume in my hands."
I was 17 when I thought this. This motivated me. If fear isn't motivating you, then get rid of it. It's just slowing you down. Fear can be good. It reflects your ability to sense danger, a respect for punishment or maybe an acknowledgement of negative consequences. Understanding that danger exists is important, but by being distracted by it you give fear too much place in your life. So, as an adult, change your fears. Deal with the negative emotions you've had in the past however you see fit and look fear in the face. The only thing you should be afraid of is wasting your potential.