I'd be crushed.
How would you feel if you're crush never noticed you?
My crush married me so I presume I would feel like everyone else would feel.
I would feel hurt. But you could make your crush notice you. Smile and say "Hi." when they walk by.
They don't know they are your crush unless you let them know. Say hi, start a conversation.
Toni is right but continue being yourself DO NOT pretend to be someone which are not cause its the equivalent of you being dishonest to him trust me as long as you are being yourself it should go fine for you