Verified answer

just wear on some deodorant

Just reiterating the "Certain Dri" answer.. it works wonders. It is antiperspirant that you put on at night (and then you do your regular stuff in the morning), it does something to the glands or pores or whatever and has worked wonders for many people Including me

Also there are a lot of girls that are sweaty like that

You can grow out of it too

I have the same problem (I know how incredibly embarrassing it is.) I found that Arrid ExtraExtra Dry works really well. I've tried everything, and this definitely works the best for me. You can also get a prescription from the doctor for an antiperspirant. I tried that, but it was too irritating to my skin. I have really sensitive skin, though, so that might work for you.

if its still a problem when your older you can get botox in your armpits - I know it sounds stupid but it actually works

certain dry you can get it at like CVS, Walgreens,Ekerd, any drug store