Age gap advice

Kind of random but i just joined n asked what to get my bf so while im here is the age gap of 21F (me) and 28M turning 29 next month, I just turned 21 two months ago and it definitely is something that bothered me mainly cause of experience which he has a lot more then me. I’ve brought him around my friends and family and he has done the same and it doesn’t feel weird around either of our groups but i can’t fail to think about it. His longest relationship was 2-3 years about 2 years ago and since then he was very social I asked once about his body count ( dumb question but I was curious) and he said his guess would be around 50s and mine including him is 13. After countless times of him reassuring me and being very sweet and gentle towards the whole relationship i just still think why me? We were in a friend group prior to our relationship where we both discussed relationship and sexual activity in this friend group prior to us dating so it’s not like this was shocking to me but now that we are getting serious i just can’t fail to think why me? I know how the girls he would see looked like and it’s nothing like me. I work two full time jobs to pay for my bills and lifestyle and it kind a hurts to think he would pay for girls he didn’t take serious to get there nails done, hair done, and even pay them to take the day off to be with him. We argued about this before and he said it was cause they asked him and when he would offer it to me i would decline. Basically i feel like he’s settling down for me in some way, i’ve had ex’s who gave this treatment to me but i never had to ask they just always gave me stuff never offered or asked. Anywho this whole relationship has been making me insanely insecure in a way I never felt before even tho he does reassure me and does everything correctly I just dislike how i feel currently, he also is a very fit gym guy and I am not that.