Nipple itch

Hey girls,

Ever since I started puberty (11ish, I’m 17 now), every now and then I get super duper (!!) itchy nipples

So I itch them and then they go all raw and kinda leak stuff which makes them stick to my bra which gets really painful

The only way I’ve found to stop it is to not itch them but I also find I itch them in my sleep so they take forever to get better once I get started

Does anyone know what this could be? Does anyone else get this and can help me?

Please help!!