Help. I dont know what i did.?

Okay so here is the thing. I'm 15. I have these freinds who i booked a holiday with ages ago and we are going soon. recently they have turned into the 2 most annoying people i have ever met. I actually havent done anything. I havent said anything to offend them, im always really nice. I never ***** abouth them i havent actually done anything. But everything i say they make fun of me. everything i do they say is 'gay' (i dont see why thats an insult anyway), they spend so much time together that it is really obvious that they prefer eachother to me. i really dont wanna go on holiday with them anymore im going to have a really crap time and i just cannot be bothered. They also have this thing that they cannot accept that i am friends with other people. I have this other friend hu always tell me that i should tell them to **** off but i am to much of a wimp. They have been my friends for 2 years and thay started doing this.....before i even met the other friend. I dont know what i did. please help. Thankyou and sorry for the long thing. x