I (m27) first of all hope this post doesn't come across as a stupid humble brag. But I am legitimately concerned about my gfs (f24) apparently insecurity about how deep I am able to go with her during penetrative sex.

I just want to be clear I am totally happy with our sex life and find everything very satisfying and almost more romantic the fact we have to go slow and steady.

But I am wondering if it's a common for women to think men need to be able to go "balls deep? Because she keeps asking me to try to go deeper and go "make it work" even when it always seems to result in her pain.

How can I go about reassuring her that I don't need her to be able to do that and that I'm happy?

Am I reading too much into this or is she actually insecure about the depth of penetration we are able to achieve comfortably?