Why does my mom think im a hypochondriac since I like health sites? Maybe I want to be a doctor someday.

Not sure. Being a hypochondriac means a lot of anxiety around your physical health status and worrying that any physical signal (pain, itch, etc) means there is something gravely wrong with you. This leads people to see a doctor frequently despite a normal evaluation and work up. Liking health related sites for information by itself does not make you a hypochondriac.