I really need help with this lisp!?

Ok I'm in 8th grade and I never noticed this before, but I have a lisp. I'm really self conscious because other people have been telling me I have one too... but no one has noticed until this year.. also I have noticed that I can say the s sound perfectly fine, but when I say sh or ch sounds my mouth is open and my tongue makes a weird shape.. it goes like sticking kindof out. Will braces fix this? Because I'm getting them this summer.. plz help and tell me ways to get rid of this... people make fun of me):