In love with bestie (girlxgirl)

I’m actually really in love with my best friend (we’re both girls, she knows I’m a lesbian/ she doesn’t know what sexuality she is yet but says she wouldn’t mind dating a girl). I feel all fluffy and stuff whenever I’m with her but she kinda avoids me #－.－)
I don’t want to tell her I like her because I’m scared it will mess our friendship but even if I do tell her and we date I’m afraid things won’t go well. Any advice?? (╥﹏╥)