Am I to short to be an outside hitter in college?

I'm currently 13 and about 5'6. For my club team, I'm an outside hitter. My mom tells me everyday after practice that if I want to play in college that I have to be a setter or in the back row because I'm to small to play outside. I want to go to a division one school for sure. But I'm tired of my mom always telling me that I'm not going to be tall enough to play in college. Is that true? Please don't tell me that I have to be in the back row or be a setter because that's not what I want to know. I just want to know if I would be able to play for division one in college. Also, I know my vertical is a big deal. I have a pretty high vertical but it's not in as much "control" as some of the other girls. I mean that when I hit i guess I kick one of my legs so when I hit my legs aren't both together. So I need to fix that. Also my blocking. I'm a terrible block. What's off for me is timing. How can I fix that? Like when am I suppose to start jumping so I can get a good block?