How to prevent chafing?

Hey y’all! I’m 17 and trams FTM, and I recently came out to my parents and have started wearing my binder consistently everyday at school (about 5/6 hours/day) and I’ve started to chafe pretty bad, to the point where even switching back to sports bras I am still experiencing chafing. It’s become super itchy and uncomfortable, stressful, and I’ve started to rub my chest raw on accident.

My dad gave me an anti-chafing thing to put on every morning which did seem to help some today, and I come home and change out of my binder right away, but I was wondering if anyone else had any tips on how to prevent it in the future or take care of my skin right now to get rid of the current chafing. Thank you!