I M15 and my gf, F15 have been together for about 4 months now. This summer break we have been home at the same time for 3 weeks, but only 3 times have we hung out together and for all 3 times I have initiated it, not once have she done it. And it is usally like that too. 2 days ago I asked to come over to her house for like 5min to give her a suprise( a poem I wrote) she said yes. Today I walked over to her house (35min walk) waited by her house for 30mins, I check snapmap and she is now at her friends house. 10min later she is home and needs to take a shower, that is fine I think then she sends me «sorry I am too tired today and can’t come out to meet you» . That is very disappointing as I had walked a long way and the friend I mentioned earlier was over now at her place for a sleepover. I feel this happens often, she prioritize her friends over me. I know we are only 15 and we are young people, but I really like this girl and would love some advice on how to move forward.
TL;DR;: My gf prioritize her girlfriends over me, and I feel like someone on the side, how should I take this up with her?