Is the ex better?

I'm talking to this girl and her past had a bigger penis both girth and length bigger while I have an average size which is (5.1-5.5 inches in length and 4.5 - 4.7 inches in girth), She finished almost every time with her ex off penetration and didn't have any pain and this was for 3 years, I get it most women can't finish off penetration but I'm talking about this scenario, l know foreplay important as well which I do that. When I asked her if she felt a noticeable difference between me and her ex she said she did we didn't have proper sex yet like I mean not more than a minute. Is it even a good chance I can make her finish off my dick cause her own words she finished almost if not every time through penetration with her ex. Can I even make her finish off penetration? I don’t wanna hear toys or or that other stuff because we both don’t like toys and two I do a lot of foreplay I’m just so worried I can’t make her finish with my average size because maybe she used to bigger and that’s what better for her idk anymore it’s messing with me. Is it possible for me as well to make her finish almost every time as well when we have sex? And even if I do make her finish is the bigger one always going to feel better for her and give her a better orgasm?