Masturbating everyday is healthy, and you're only doing it a few times a week. So, I doubt it's having a negative effect on you.

As for whether or not you're attracted to girls well, how old are you? Maybe you're not old enough to like girls, which usually happens a few years after a boy discovers his penis.

Have you discovered if males turn you on?

Apart from that, you may be asexual. That is, you aren't attracted to anyone, and you simply masturbate for the pleasure/release.