How do get rid of a lisp?

I'm 15 and i have a lisp and i hate it. I'd do anything to get rid of it, and i know that is sounds kind of gay when i hear it in a recorder (and i'm not gay). Is there anything i could do at home to try to get rid of it, or at least minimize it? i can't really go to a speech therapist because i live to far away from any, 2 hours in fact. Thanks in advance.