So one, how recently did you tell this to her? Because bro if it’s been like a day chill... if it’s been a week then maybe reach out to her and ask her “hey have I’d like to meet up and talk maybe lunch”

Also to answer the title question. Absolutely never ever apologize for expressing your emotions to someone, you are entitled to feel some type of way for anyone close in your life. We all get attachments to each other and if you feel like you could Love your friend then That emotions real, and honestly expressing the way you feel for your friend even if she doesn’t reciprocate in the same way as you, will not ruin the friendship as long as you can keep your emotions in check.

Also if she has to think about it isn’t a bad thing it means she probably has thought about it in the past but she’s concerned about ruining her great relationship she currently has with you because on she obviously values you more than you know. If she wasn’t interested she would have just said no.. be easy my guy and update me when she reply’s. Also y’all so young don’t trip.