Age Difference

I'm 19 and my boyfriend is 25. It was hard for my family to get over the gap bc we started seeing each other when I was 17 and he was 23. We love each other, but sometimes I have a hard time because he's so much more experienced than I am and it makes me feel bad that he has so many more memories than me. I know I'm mature, but it feels immature to feel this way.. But I can't seem to shake this feeling even tho it's been 2 years now..