ore is just as valid for I as watashi, only not in your case, as it is exclusive for males, boku, the little brother of ore however is used to females occasionally. If you want to sound feminine just go ahead and use atashi.
Although ore means I, I can't come up with an example for it, so I'll compare it to the word You.
Saying ore is like saying something like "Oi, you!"
Similar rules apply to the words temee, kisama, omae. The latter might be used between equals close enough, but the first two should be avoided unless you want to piss someone seriously.
Since you're female you can sometimes use koto instead ka when asking a question, when you hear males do the same, you'll encounter the particle na, which is a rather tricky one, but very identical to ne, only it sounds way better lol
Also females tend to use wa sometimes at the end. They generally drop da more often.
Well in a nutshell thats what you should know.