I am scared to confess my feelings to my female friend. What do I do?

I really like my female friend. I also think she really likes me back. When is a good time to tell her? I am so scared of losing the friendship we have built over years, but I don't want anyone else to be with her but me. Can I tell her, but say that I am happy to remain friends if she is and have an open and honest conversation? I have been holding this in since I first met her.

I am scared to confess my feelings to my female friend. What do I do?
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