And dude, you are only 13...you have no experience in life, so it's normal your parents don't listen to you...And i bet you are screaming at them when you talk about pot...
Even if i am not right up there, you gotta know they have the big part of the bat...
Instead of being close minded to them like they are to you, try to enforce a relation ship with them, you know parents do care about you and if you're not close enough to them they'll want you closer...

It's maybe hard to face it up but pot is not good for you right now in your conditions, wait till you get a lil more liberty...

-Peace out