I don't know what to do. This is really hard to explain but I will try.
So, there is a music festival, called Ultra in Miami sometime in March. It is quite a big thing: three days, 150 000 people, the best djs from all over the world... I live 4 hours from Miami. My mom proposed my stepbrother and me that she could pay for our tickets (they are very expensive) and we could go. The original plan was for me and my stepbrother to go to Miami with some of our friends: three girls and one other guy. We would then stay over at my mom's apartment for three days alone

and that sounds amazing! But then, it turned out that the girls can't go. And so, now I would go with my stepbrother and his friend for three days alone to Miami. And that's the problem... I know, sound like a little child, but I'm scared. I'm scared they won't like it (I'm the only girl, I will feel responsible for them having a good time) and I fear it may get a little crazy. Too crazy. But if I say no, even though I want to really badly, I know my stepbrother will blame me because he can't go without me (my mom is paying for his ticket). I feel so bad that I have to let him down like this, I just can't deal with that. I've lived with him for only a month, I don't want him not to like me. Or maybe I should just go with them?
I'm 16 and I don't know, it seems a little too early to just go with two, 19 year-old guys to one condo, to another city.