What infield position should i play?

use should play 2nd base or shortstop. Thats where the fast skinny weaklings usually play.

Shortstop or 3B.

since you can throw, it all depends on your fielding ability. you can play 2B, but if you have the ability to field the ball cleanly, and frequently, you can play 3B. If you also "know what you're doing" on the field, as in you know where to play, you can play SS, since you're also fast.

Shortstop or third base, although you may consider pitcher. If you want an utfield position, CF is for you.

It depends how strong your arm is. If you can throw the ball across the field in minimal time, then try for third or short. If you're only able to make the shorter throws, then try out for second.

I'd say second also because it is the easiest of the infield positions to play,because the throw to first is easy because its so short distance and also to second base if there was a runner

shortstop, you need to be fast to run after ground balls, and since you have a good arm, you can make good throws to 1st

you should gain a little more weight, but 2nd base would be a good positon