I am a bass player who is the bassist in my band.
And I write songs, and I play guitar, keys, percussion, and anything that makes noise to make music.
Funny thing happened to me about decade or so back. I was playing with my band on stage and we were a 3 piece plus a singer. We covered a lot of pop tunes and I would cover a lot of the synth lines. Same lineup for about 6-7 years at this point. Anyway, dude comes up to me asked if I play guitar, and I said "yes I do". He says to his buddy he strung up to the stage with him, and says "yeah, I knew you weren't a real bass player"
Perceptions are funny thing. I always felt Bass was more natural, but I don't limit myself to that.