Bit of context

So I (20M) have been with my (20F) girlfriend for just about 2 years, everything started off great initially but as time went on things started to change. We used to do it quite frequently, sometimes multiple times a day and she was very open as to what activities we could do, but as time went on she slowly started losing interest in doing it. I’ve always had to initiate and when I do I always get shut down, she wants me to be more confident but after a year and a half of getting shut down more than ever doing it I’ve lost all self confidence when it comes to this as well as interest. Like I’m still attracted to her and I still think she’s absolutely gorgeous and smoking hot but like it feels like I want it but at the same time don’t. She’s very closed off now which kinda sucks but it’s not the end of the world, my problem is I get that in long term relationships things don’t stay spicy and new forever but going from having it 5 times a week to like once every couple weeks has been driving me insane it feels like. And on top of this she was originally going to school to be a child support worker but out of nowhere was offered a iron working job and took it, now on top of not doing it lots in the first place she added a hard ass labour job on top of it, she never wants it and I’m a carpenter so I get the tiredness but at the same time I used to stay up until 1am to have sX and wake up at 5 but now she can’t even do it with 8hrs of sleep on top. Like I don’t get how she just lost everything towards sx. And as for my confidence she completely shot that down, I used to be masculine but I’ve been in the trade for 3 years busting my ass making 24$ an hr and she comes out of nowhere with a job making 31$ an hr without any sex. Like I don’t even feel like the man of the relationship anymore and I’m heavily debating breaking up but I love her more than anything. Idk what life is like without her and I feel like a douche for wanting to break up for lack of sex and higher paying job but she’s lost interest in it completely it feels like and she won’t do anything about it, not even couples therapy. She’s a great girl and I don’t want to lose her but at the same time it’s been driving me crazy and I’ve brought it up so many times, I feel like I’m just ready to quit tbh.

Any advice or anything would be greatly appreciated!