How to heal a sunburn? I don't want cancer!?

Okay so I was out all day today and I got a REALLY bad sunburn on my legs, shoulders, chest and face... It's really bad! And if you get a bad sunburn before the age of 18 it raises your risk of getting melanoma (bad skin cancer) by 40%!!! So I'm REALLY worried! I don't want cancer! It doesn't really hurt so that's not the problem... I just want it to actually disappear so I don't get skin cancer when I'm older. Thanks!