Name this type of lisp and help me get rid of it.?

I cannot say slow, sled, slong, slip, slime, slacker, sling, slu t, sl ag, slip and any words with s + l or x's or lots of s' i think i talk out the right side of my mouth help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!… i wanna be a rapper blood so help me out kidda