Like someone who I shouldn't?

OK, so ever since I met this girl I have been in love with her. The problem is something is just telling me that I shouldn't like her. For the purpose of this I'm just going to call the person Jill. So Jill is amazing and is really like everything about her, but she is more out going while I'm more reserved. I'm way more focused on school as I'm going onto medical school, but I still see her try in school and she is ambitious which is a quality that really matters to me. We talk some (as far as I know she doesn't know my feelings) and I really can't tell how she feels back. She is wonderful, just something tells me not to like her when she is amazing and my heart is telling me to go after her. Please help me!!!
Like someone who I shouldn't?
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