Have I wasted my life?

hello, I am 19 years old I graduated from High School last june and I am going to start Medical School in the Dominican Republic. I missed out on a lot of things in my teen life, i never had a gf,never been to a party,didnt go to my senior prom, i was overweight through out HS and I still am which made me a loner and a bashful person. I feel as if my life is over i am very suicidal and I cant take it anymore, I dont want to grow up and I dread to turn 20. I wish i had fun and did things to have good memories but i didnt. All I did was eat and study. Now I feel as if my youth is finished and there is no going back, i feel very old and I will never be able to find love. now i just want to die because life will always be the same for me. I hate my self now because i am ugly, fat,and I never want to accomplish anything. Did I really waste my life ?, Am I now an old person way beyond my prime ?