What do i do?

Me and my girlfriend have been dating for almost 2 months now, around 2 weeks ago, we were really close, we went on a school trip to Belgium and we were like rrally enjoying each others company. But now, when weve got back to school, i feel like shes sort of avoiding me. Shes gotten really close with this girl, who is also my friend and i have no hate to her, but my girlfriend will always openly leave me to go see her, she rarley hugs me anymore and i feel shes only dating me for the recognition. I feel as though she isn't as committed as i am. Shes my first relationship. The first person ive actually loved so much that i cry just thinking about it. I just dont know what to do. And i know she has other friends and stuff but what about me? Like im your girlfriend so shouldnt i be first on your list? Shes first on mine so.
Idk i dont want to break up with her but i feel weve lost connection.
Please help me. Thanks .