What do you imagine yourself as?bottom?top?switch?

To those who masturbate by fantasy/imagination with/without physical stimulation, what position you imagine yourself as?When first masturbate using yaoi to fantasize things, i imagine as bottom. Later, when it is not effective anymore/taking too much time, i imagine as the top. Nowadays, i think i sometimes become a switch. Only in my own head, of course. Is there anyone here like me?