Unable to have intercourse

I’m 18 and a Female, first time I tried to have sex I was 16. I knew before hand that it will probably be painful in the beginning so once you get through that pain it’ll feel good afterwards. I went through a lot of pain trying to have it go in me a lot of different positions , and I actually did bleed a bit but it never was able to get past like 2 cm. I continued to try I thought maybe I was just too tight so I tried to use a pinky first and put that in start off small and work my way up. But even a pinky was very painful and unable to go inside. I talked to a few of friends and they said that since I have Endometriosis (Period Disease) sex might just be more painful for me. But I was still struggling to do stuff. Every relationship I go into they believe that they’re gonna have the special dick that will magically go inside and it hurts me so much to even try. I’ve tried going with full force and all that did was push my hole body forwards and cause a lot of pain. I went to the doctors and they told me to see a gynecologist which I can’t yet afford. But they had told me that they weren’t able to figure anything out because after trying to stick her pinky in she was unable to figure out how else to check as if a pinky can’t go in neither can that giant metal thing. It’s extremely embarrassing for me and I lose 90% of relationships because of this and the fact I can’t suck dick totally different problem to do with me vomiting even at the thought of saliva ( even my own yes). Also even in my most calm states when I feel good I can’t make any extra progress in going in I just get more wet. If anyone has any idea of what this could be or something like that I’d love to fix it. It’s my biggest insecurity I have to tell people exactly how I can’t have sex properly all the time and explain it before I date them because I don’t want them to just leave once it’s been so long better to rip the bandaid off but I really would rather the problem was fixed so I am not as disappointing.