In spite of how much you admire this person, you're afraid to commit to them. That your heart could be shattered is a major fear of yours.
You don't want to say anything that may damage the friendship. You're worried that the two of you won't be able to work things out and that your relationship will end.
It's terrifying to think that they may not share your feelings. You worry that you have misinterpreted their signals.
You're worried that becoming buddies will help you more than working together. You're concerned that kissing them wouldn't feel natural.
Because you worry that your emotions may overwhelm theirs. You worry that they will agree to a date with you to avoid upsetting you.
Don't want to put yourself out there and ask them out. You're worried that the date won't be as successful as the ones you've had in your imagination.
You worry that they may think of you as a sibling. You worry they don't see a future with you.
You worry that you are beginning to develop unhealthy feelings for them. You're worried that losing them might be too much for you to take.
You worry that they haven't gotten over their ex-lover. There's a fear that you won't measure up.
Fear of causing harm to them is keeping you from acting. The thought of hurting their feelings paralyses you.
You worry that you've begun to conflate platonic companionship with sexual desire. Your fear stems from the fact that you think hanging out with them may go badly.
Fear that they will reject you because they have a good understanding of who you are is understandable. They are well aware of your many shortcomings and bad habits.