Convincing My Parents To Let Me Go Camping With My Boyfriend?

I'm 15 And So Is My Boyfriend. His family recently asked if I would like to go camping with them. I've Never been camping before and my mom hates it so we never go , she killed the fun for the rest of the fam. We've been together for 1 year and my parents and his parents know eachother and they talk sometimes. My boyfriend and I will be sharing a tent with his little sisters , one of them is 12 and the other 7 , so we won't do anything. His parents , grandma , uncle , and aunt are going too so we won't get into any trouble. I always help around the house and get A's and B's. I also want to go on this trip because my parents promised if I didn't have a quinceanera we could go to the snow and take my boyfriend , but I never had a quince or a snow trip , so I thought this could make up for it. Anyways , I really want to go but I don't know how. I told my mom when and who's all going and the tent thing , and if she wants to know everything else to call his mom. I asked today and she said I don't know maybe not , but I reeeeaaalllyyy wanna go. Can someone please help ?