What should i do? am i bi?

okay, so about a year ago i started to think i was bi beacuse i would look at girls and think about them the same way i think about hot guys. so my female friend who IS bi told me to kiss her to see if i was bi. and i did...then we went further and i liked it, it felt natural. and just recently she asked me out and i told her i no because im scared..and i dont feel ready to go into a realtionship with a girl yet. then she got mad and asked me then why did i do all that other stuff if i wasnt ready? i said i wnat to be in a relationship with a girl but i also dont because i want to be with a guy OFFICIALLY before im with a agirl and im also kinda scared. so then she told me im not bi and to stop toying with her feelings..what should i do? am i bi?