I've told this girl lets call her kristen I want to hang out and she said she wants to but now I kind of like this other girl named sarah but I'm kind of fat and I don't want to give up this girl to go after another when I don't know how she feels about me. Sarah has seen me and tells me she doesn't think I'm fat or ugly but she might just say that to be nice or maybe she really thinks that. What can I do?