Could I have PTSD from being shot at?

I have struggled with anxiety and depression for about 8 years now, I am 20 yrs old. I had it before this event happened. When I had just turned 14, me and 3 friends of mine were riding our bikes on a trail and got off our bikes to get in a creek next to the trail. While me and one other were in the creek, some beligerently drunk old guy who lived in a house next to the creek came over to us shouting, calling us cocksuckers, fags etc. We kinda told him to fuck off, he went back to his house that was like 20 feet away, grabbed a handgun from his car, and started shooting it. It was one of the scariest moments of my life. We all got on our bikes and rode as fast as we could,but i felt like i was moving in slow motion. None of us got hurt but to this day it kind of haunts me. Ive always tried to think that it wasnt that big of a deal, but considering I now have avoidant personality disorder,maybe its possible i have ptsd. I dont know. I just needed to let this out to someone.