My girlfriend didn't let me go to my daughter's birthday

I (22m) have a kid with my girlfriend (26f). I love her so much, and last week it was her first birthday. there's been a lot of stuff going on between my gf and me as well as our kid, but it hasn't really stopped me from being there for my daughter. And building up to her birthday, I was doing everything. Like I was prioritizing work over school this past month to save up, I was planning on inviting my family and friends, I wanted it to be special. But ong, literally 2 days before her birthday my gf told me she didn't want me to go. We agued over it but in the end I just accepted it. But everybody else I invited, went still. My friends, some of my teammates, they all went. And I don't think any of them called me when they were there, if they did it was just to ask me where the place was. It was like they all forgot me. The only person who did call me was my mom, and she only did it to get mad at me.

Since then I got to blow a cupcake with her and ig it was nice. But I just want to love her and be with her, and my gf is making it so fucking hard for me to do that. I want to be in her life, and the whole time since she was born, I feel like I've been doing all that I can. I understand how hard it is to hold a baby for 9 months and give birth to one, but the whole time since she was born I've had to mix school and sports and my job and taking care of my daughter. I just want to rest, but I know I can't. idk what to do with my life, idk where I went wrong