Handle the size request

Hello, how man handle the request of the girlfriend/wife to have bigger dick and request a sleeves. How did you manage your self esteem knowing that you don’t have the right equipment to fully satisfy your SO.

I’m afraid my wife demand to have bigger, I’m feeling her vagina gets wider when she’s very arouse and I’m felling less and less her walls.

For more context she was a virgin when we got together, I had one sexual experience before her.
The girl I had sex with said to me the sex is ok but I don’t have penis that give her a « full and stretchy » sensation

I have a slightly below average penis with a decent girth but I’m also realistic that she haven’t a small vagina and with my previous partner the experience with great but I got that reality check I’m not well endowed.

I’m afraid my wife demand more and I don’t know how I will handle it.