Not at all, If you wanna play football have at it. If some people tell you that you're too small prove them wrong like Russell Wilson. He's 5'9 and he's the Starting QB for the Seattle Seahawks. And he's doing a hell of a job (excuse my language). But go for it.
You're only 13 dude, go play! You're way too young to be counting yourself out. Try it, you'll get taller, you may find you'd be better at another position, whatever. If you're curious about the sport, give it a shot
Yes.
