Nipples

So I'm 22 now but since i was 18 i always noticed that after taking a shower and drying myself off my nipples felt sticky. Like if i would touch them with my finger it wouldnt feel dry just a little sticky. Is that common?

There is no discharge coming out of them. No milk nothing considering im a virgin. Even when i squeeze them nothing comes out.

I was worried so i got my prolactin levels checked too at the age of 19 i guess and they were all normal. The doctor just shrugged off my concerns after the test results came in.

Apart from this i dont really have any issues. But this issue still persists as of now.