Need advice from 2nd time moms

Nunu Mother Of 2

So I'm 20 weeks pregnant, in my 2nd trimester, feeling baby kick and everything is going great! However, I thought I left breast aches in the 1st trimester. The sensitivity never went away entirely but it lessened a good amount. For like the last 3 weeks tho, I've noticed whenever my nipples are squeezed a thin, clear substance comes out and I looked it up and found out it's called colostrum. That's fine BUT why are my nipples now supppeeerr painful again? The cold, bras, the shower stream, etc. cause me soo much pain and I'm jus wondering if this is normal??