Is it possible for my different personalities to want to major in different things?

I'm working on all my college applications and I can't really do anything with each "person" telling me a different thing. Is this possible?

ON ANOTHER NOTE: I know your personalities can be completely opposite from each other, but can they be a different gender too?
I know one of my alters very well and can talk to her like a friend.
But then another alter is completely annoying and I lose memory when she comes around. She is bad news.
But then there is my third one that I'm pretty sure is a guy. Is that possible?

I would appreciate your advice. please and thank you