Do you identify equally with both these "personalities", or do you consciously support one of them and assume the other one exists because of your actions?

They are both "me". I have tried siding with one in the past, but that didn't help and only made me miserable and depressed.

I've had similar "splits" before, but always managed to merge or drop them. I saw a thread on reddit recently that mentioned that many teenagers develop different personas to experiment with, most typically as an offline/online split. (I did too. I guess I've gone through about 5-6 personas during puberty.)They never really diverge much, however, and often get merged later. It's just that for me, the fork stayed and I now have (accidentally?) two fully developed sides that, despite lots of overlap, want to work in quite different directions, and I can't undo or integrate them, yet. Unfortunately, economic strategies like time sharing or voting don't work at all (or I just suck at implementing them).