If you want to have an art job/freelance and still do personal work, you've got to make a conscious effort to draw your personal stuff and keep yourself on a schedule. Like I try to do one page of comic and one personal illustration a week. I'll take weeks off for personal stuff, like if I'm sick or if I'm going on a trip/having a friend visit, but other than that, it's a page a week minimum. Since I've been doing that routinely for years now, it doesn't even feel like a question anymore. I just do it without thinking about it too much.
My current situation is that I'm freelancing illustrating/writing comics... and illustrating whatever else I can get my hands on from magazines to concept art to band merch to pieces for gallery shows. And also working at a local gallery a few days a week to pay off my monstrous art school student loans. At times, I'll have a few projects going at once and it'll be pretty exhausting, but I still make sure to not let my own stuff fall to the wayside.
I have had to give some stuff up though! Like I used to LOVE playing video games, but once I graduated college and jumped into the art thing I haven't had as much time for it. I'll still play 3DS stuff sometimes, but I don't really get to just chill out and play console games for hours on end like I used to. I also don't go out with friends as much as I used to. But to me it's worth it because it's my dream to be an artist and I realize I have to work really hard to achieve that.
I guess what I'm trying to say is that if you WANT it, you can do it. But you have to really want it. And you have to be willing to make sacrifices for it. It's not always going to be fun and sometimes you're going to be like night of the living dead zombie tired, but if you want it bad enough you're still gonna draw. If it's your dream, the drive comes along with that.