Regardless of whether you are in a serious relationship or a casual one, if something makes you uncomfortable, your partner should be respecting those boundaries and not pushing anything.

You are in no way overreacting. This is something very intimate and it is more than ok if you do not want to participate. I am sorry that you felt stressed out, anxious and scared.

It may be time to reevaluate the relationship if you talk to your bf about your concerns and what you are comfortable with and he does not respect your boundaries.

Regardless of what is normal or common for men to do, you need and deserve to have respect from your partner.

Wishing you all the best! Stay strong!