I'm 100% certain people like this person aren't rejecting you because you look up to them. Everyone likes to know people admire and think highly of them.

From what you said, it is clear that unfortunately the way you act towards people when you look up to them(or care about them) can be a big overwhelming and intrusive. It's nice to give people attention and so on but there should be a balance, especially when you're not on best friend status, otherwise they might find it a bit too much and even off putting.

Again, it's not the feelings you have, it's that you exaggerate sometimes. Did you act similarly with the other people you looked up to? I'm guessing the answer is yes. You have to consider that what to you is normal and fine, to others might be too much.

So maybe just try to be friendly in a way that gives people a bit more space.