If you're not ready to date, then you're not ready to date. Don't let your dad (or anyone, for that matter) tell you otherwise.
Don't know if you like boys or girls? No problem...just live with that for awhile, it'll sort itself out.
Don't know if you're a man or woman "on the inside"? That'll sort itself out too. Just live, do what you feel is natural for you. As time goes by, you'll find your place(s) on the gender/sexuality spectrum.
There's no rush. Have fun with it, as much as you can!