Should I confront my stepmom?

My parents are divorced and both remarried and my stepmom is sometimes kind if mean/rude. My aunt lives in Washington state and I'm very close with my aunt so I've been saving for a plane ticket. I had about enough money for a ticket last summer and the issue was I didn't have someone to fly with. My stepmom and her family used to live in Washington so they always wanted to go back and stay with my aunt so they could see where they lived again. So I didn't find out they (stepmom older stepsister and stepmoms mom) where planning on going until last month. And they just like talked about it right in front of me like they were rubbing it in. They didn't even like think to invite me. Plus my stepmoms mom is paying for all their tickets when I could pay for my own ticket!!!!! It makes me so mad! Does my stepmom hate me? Should I confront her? What do you think? Another thing is not even my aunt has said anything to me and we text a lot. And she is my biological aunt! Should I confront either of them? I'm so confused. My aunt and I have been planning this for years! Urrggghhh!!!!!!!!!!!