I was always the skinniest guy in high school, but played football, basketball and baseball, to great success. But I was about 5'8" at the time and was not considered a jock. So, I hung out with a group of nerds and did very well in academics. Believe me, you can overcome anything you think is a disadvantage. In fact, I grew another two inches in college, so you might gain more height yet.
I also had a baby face and looked younger than I was. Maybe you are worrying needlessly about this because I didn't find it a problem. I still look younger than I really am and you're right, I like it now that I getting older. You'll find that high school will fade from your mind as soon as you go to college and meet a new set of friends. My wife is seven years younger than me and was attracted to me, not because I looked a certain way, but because I was soft-spoken. The lesson there is sometimes you might never know what attracts a woman to you.
There are plenty of women out there who will like the way you look. And most women like a man who has confidence and is secure with himself and has a sense of humor. You don't have to perform magic tricks or brag when you meet a girl, just be able to converse with her and, most importantly, listen to what she has to say.
Now, for me, Pink Floyd was the best concert I have ever seen, but the Rolling Stones were also very good. I saw Paul McCartney a few years ago and had a great time because I was a mega-Beatles fan.