Pegging... Really need some advice!

So my boyfriend and I have been together almost 2 years. A little while after being together we started talking more about what we like sexually. He told me he likes when anal toys are used on him & the female being Dominant. I don’t know why but I felt very insecure about it. I am always submissive and don’t mind a little pain and being tired up but I don’t think I could ever do it to someone else.

Fast forward to the recently, I have been reading more about it and trying to be more comfortable about it but it just seems that I can’t. We recently had a night out of town (without the kids) and went to a sex shop and he bought me a strap on to use on him... well I did and it made me feel extremely awkward. I just want to be able to please him sexually and I am scared if I don’t he won’t want me anymore.

***I know he would never leave me because of it but due to past verbally abusive relationships of me not being good enough my brain wants me to think he will****

SO PLEASE SOMEONE HELP ME!!

Is it normal that straight men like to be pegged?? How do I make it less awkward? Will I ever not feel insecure about doing it? Also, what are some tips that can help me out with the situation???

PS also my first post so I’m sorry is I rambled a bit lol