Why do I get way more mosquitoe bites then my friend?

My best friend and I are always together during the summer, and we will go on her tramp all the time. And she lives by a creek so there are a lot of mosquitoes around. But the weird thing is that I get bit constantly all the time, sometimes I will have up to 50 at one time. But she only gets bit every once in a while. (We also both wear mosquito spray usually too) What could be some reasons I get bit more?