Friendship and love

You know Stella for your whole life, you two have always been really close friends, best friends even. Now though, you struggle with fact that you fell in love with her. How can you say this? What if it breaks what you have now? What if you take a wrong step? Too many questions, not so many answers. You have to figure out how to get to know how she really feels about you without making her know how you feel. How will you do it?