Yes they can be dangerous, I have been in a family of riders for my whole life. (not that my whole life has really been a very long time yet) But I told my dad that I want my own motorcycle.
@Hannahjay14 seems like going from 4 wheels to 2 is a natural progression. and if you can ride a 4 wheeler (even to school) seems like you're ready for a bike.
won't tell you to be careful - that would take half the fun away :)