Am i gay, bi, or straight? PLEASE HELP ='( ?

Ok so i am 12 and for a while i thought i was gay. I told my gay friend (we'll call him bob) and bob was happy because he had liked me all along. I was happy and that night we snuggled and held hands. After a few days i figured it was just puberty and told him i was straight. And then he started to hate me. I am now thinking again i may be gay! I find bob and another boy in my cl cute and also i find it so amazingly brave and "broad" to be gay. I think i would rather be openly gay then openly straight but I'm not sure. I wish me and bob were openly gay and that he could go to the mall and stuff together. I also like about three girls in my grade. When ever i unintentionally think of "guys" (like in science cl we did reproduction) i got a b0ner. But the same goes for girls. What do you think? is it puberty or what? Also do you think i could ever get bob back? If you want share your own story about when you found out you were gay, or bi.