Being a slut is about the strength of your lust and desires. Not about the quantity of people, animals, or objects you choose to fuck.

If you masturbate daily, you're a slut.
If you fantasize at regular intervals, you're a slut.

If you had the outlet, you'd probably make use of it.
Don't deny it.
Embrace your inner slut

Heck, embrace another slut while you're at it. :)