Am i SERIOUSLY losing it all at 18 years of age?!

Am i SERIOUSLY losing it all at 18 years of age?

I remember when i was 12-16 years old, i was good looking and many girls were after me. They say im cute, and its like i dont have to do anything to even get their attention, theres this girl who even confessed that she liked me in front of me!!!...

now im 18, and no girls even look twice...i used to have a girlfriend but broke up in just 3 short months...pathetic...

also, when i was younger, i was stronger and fitter then all my classmates( probably due to my early puberty ), now i find im not that strong compared to my classmates, also i used to be in the taller end, now im below average in height...

And when i was younger, i had EXCELLENT basketball skills, had a freak knee injury at 16, and my knee never felt right again even after operation(acl tear), now i find im slower when playing basketball, thus affecting my skills greatly...

also my primary school i easily topped my class in maths and science, constantly get top 3 and got straight As for my end of primary school exam, its like im naturally borned smart and don’t have to study much…now, I got retained in junior college and decided to switch to a polytechnic course to pursue a diploma cert…

am i losing it all at 18 years of age?

Stop putting yourself down! Please remind yourself you are still rather young,meaning you still are learning a lot about life, I know you don't want to be thought of that way but I am A LOT older then you we all go through good and bad years that is all a part of growing up.Most important, learn to like yourself cause if you have confidence on the inside it will show on the outside! Say to yourself I am good looking and I am someone important!
Good Luck!