If you enjoy skating and think about doing it, then start skating again. Get a new board and learn how to do it http://www.brailleskateboarding.com/
Otherwise, find a different hobby that you like better.
I do ju jitsu used to do karate and skate, plus im 15 too, weird. Anyway, skating is a fun passtime, dont let the people at your skatepark stop you doing it, and it doesnt matter if all you can do is ollie, you will progress in no time. Allthough i would only start again if you have someone to skate with. Also, you should get a new deck if your old one is smashed up, skating on it will just put you off it.
Good luck skating again
Hi there,
You should do whatever makes you happy.
If you miss skating then take it up again, if not then look into a different hobby.
No, just start doing martial arts.