Hello first off sorry for the bad grammar nit my first language

I (f23) is in a relationship with 2 others for about 4 months so it's all new to me, I need some advice, the first time all 3 was together they affection was very 50/50, but the second time we met it feels like it all is going to the other person and just ignoring me, they are always just cuddling, kissing and flirting with each other, I have tried to talk to them how it makes me feel but nothing has changed, I'm just so lost on what to do cuz I really love them and don't won't to leave, but I just feel so neglected and just a 3rd wheel. So please I could really use some advice on how to go about it/handle it