i go by a last name that isn’t my legal name. Help!

Hey there!
So, FH and I are super excited as we just put in the deposit for our venue and now we’re looking into ordering our Save the Dates and Invitations.
However, something I didn’t think about until right now is that I’ve gone by a different last name from my legal one for a few years now. My father was not great, and having his last name hurt me in a lot of ways. I knew me and FH were probably going to get married within a few years, so I decided to just start going by my mothers maiden name instead of going through the hassle of changing it legally.I go by that last name socially, on all social media and basically anything that will allow me to. I’m not inviting anyone from my dads family to the wedding (I’m just not close to any of them). It seems like it’s customary to have the bride and groom’s full name on the invitation. I don’t really know what to do. Most people know I used to go by a different last name and now I don’t, but I’m not sure which one I should put on the invite. On the wedding contract and any other legally binding stuff, I put my legal last name. I really do hate that last name. Can I use my middle name instead? I don’t like that one much either but I prefer it over my last name.