This happens to me like all the time. xD
I'm mostly on my fursona, but once there's no one to talk to I tend to go on one of my OCs and RP. However, most of the time no one's online in my RPs, or no one pays attention to me, so I get back on my fursona. x3
Also, creating new characters helps me to get less bored. But sometimes I'm just like, "No." And I give up on it. When I actually created a character I like, I play on it for like 30 min, then I get bored, go on another character, and never use my newly created character again. Only when I feel like it. xD
One last thing, sometimes when I want to change characters I change my mind and get back on the character I was playing on. cx