so in conclusion, if you want to call yourself a musician, and doing so gives you pleasure - do it!

life is short.

its not like you called yourself a brain surgeon, and you want to cut someones head open.

you mustn't do that. however being a musician is open to interpretation - and I've seen bloody good musicians die on their arse.
being skilfull doesn't ensure acceptance by an audience.

your vision of yourself as a musician is as good as anyone elses.