Masturbating and self consciousness

When I was dating this guy, we decided to masturbate together. Afterwards he made fun of me for the way I did it and said “wow you got really into that wtf”. basically he was an incredibly toxic and terrible guy and put his sexual guilt onto me. I was comfortable with my sexuality, while he thought having sex was a sin (although he forced himself on me many times!!). Even though I know how messed up he was, I still feel so self conscious about

the thought of masturbating in front of my new boyfriend (who is nothing but love). I don’t know what to do or how to heal from this. I feel like my ex is the cause of so much pain in my current relationship and love for myself.