stuck at age 16

Uhm hello... I'm a 20year old female who recently discovered she has a trauma. Uhm okay on the day of my matriculation into college I and my friends like every other female went to get our nails and makeup done. On reaching the salon where we were supposed to get our makeup done, I received a call from my mum saying she was already in my school where the ceremony had already commenced. She said she came with my little sisters and my dad, mind you, I wasn't aware she was coming with any of them, if not I wouldn't have gone to the salon with my friends. My dad's a bit strict about makeup and all those accessories so I lied and told my mum I was not done preparing and that they should give me 20 minutes. After the call, I told the lady incharge to give me a simple and light makeup and she agreed. Halfway into the makeup my phone started ringing, it was a call from my dad. I picked it up and he yelled at me through the phone asking where I was, tensed as I was I lied again saying I was on my way before ending the call and telling the lady to round up the makeup which she did. I wore my dress and ran out taking a cab straight to school but traffic decided to hand me the short end of the stick. I was shaking in the car as my phone kept on ringing which I didn't pick up. Long story short I got to school after 30minutes or so only to meet my enraged parents and uncle glaring at me as I strolled in. No one told me my uncle was also coming. With a small smile etched on my face I got to where my parents sat only to receive a resounding slap from my dad but I kept the now crooked smile on my face as I noticed alot of people staring at me, a few of my male friends and course mate included. I greeted my uncle smiling as tears slid down my face. "You're a disappointment" my dad spat "I regret having you" he spat again and slowly the smile faded as hot tears were now streaming down my eyes lol. He immediately brought out his Handkerchief and began roughly wiping the makeup from my face. "Go and wash that rubbish off your face" he finally yelled sitting back down my family members watching In silence as I walked out to go wash my face. A few of my course mate followed me out as they helped wash the makeup off my face talk about an embarrassing but soothing effort. Anyway since then I can't attend any school ceremony. One time I was in a bus and I saw some high school students on their graduation gown smiling happily as the walked down the road and I started having an anxiety attack well it's gotten worse I can't even watch a movie where students attend prom or celebrate getting into college what should I do it's been 4 years already.