Every single man I’ve been with hasn’t been able to get an erection when it comes time for penetration. Is it me?

I (20F) have been with five sexual partners. Every single one (other than when I was assaulted, not counting that) have had erection issues and had difficulty penetrating. At first I was like "Yeah, he's nervous, totally get it", but I've started to get in my head about it a bit now that I've realized it's been everyone. Things get better the more times I have sex with the individual guy, but jeez it'd be hard to say it's not a bit of a blow to the self esteem. And, just to be clear, I don't shame anyone for it as I know that it's not their fault if their body decides not to cooperate with them in that moment. I'm more than happy to be eaten out for a bit if we can't have PIV sex. I'm just wondering if there's something I can do, or at the very least if I'm just off putting I'd like to know.