Flat nipples randomly are now out?

My nipples have always been flat/inward naturally and would only come out when it was cold, etc. Recently, my boobs/nipples have felt a bit sore and I just realized that I think it’s because they have been out almost permanently rather than flat like usual. Is this normal? I’m 26 and this is seemingly out of nowhere. I’ve never really had much feeling in my boobs so it’s extremely aggravating tbh. I’ve never even experienced breast tenderness during my period or anything.

submitted by /u/Dontknowwhattodo1998
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