As you are 13 and masturbate frequently, that is OK, nothing wrong in doing that, just do what comes naturally. I too masturbated frequently at 13 and 14. You should not feel sexually frustrated, I would advise you to take longer when you are doing it, remember quality is better than quantity, do it a lot but take your time and that way you should not feel so frustrated, you will have a wonderful and pleasurable orgasm. You say you are attracted to many people, I assume guys in some way looking at them make you want to masturbate, that's is fine, many boys when they see a female want to do exactly the same thing. Experiment to improve your experience, if one way does not work, try another way. Yes you are too young for sex, do NOT have sex before you are 16, good luck, remember, take your time.
It's normal to be attracted to a number of boys at 13. Too, it is great that you can masturbate and orgasm. My advice is simply to continue looking at different guys and keep masturbating. You have plenty of time to go further than that...Please don't make the mistake and go too far too soon.