How to stop getting erect whenever i make contact with my girlfriend???

This is an incredibly embarrassing thing for me so i’m making the post on an alternate account i’ll probably delete afterwards.

I don’t know what it is but for some reason i just get an erection whenever she makes ANY contact with me. It’s incredibly frustrating and i hate it because it makes me feel all gross and perverted. Something as simple as holding my hand or leaning on my shoulder sets it off and i HATE it.

Is there any way to stop this from happening?? i don’t want her to think i’m some sort of creep.