When I came out of uni, the only job I could get for a good 3-4 years was retail - and I hated it - soooo much. It sucked me dry and it was really hard to be motivated when I was in that position in my life. But because it was part time, I DID manage to get myself out of a hole of self pity, I did manage to work on some personal projects, get a showreel together, and get a job as a motion designer (not quite what I wanted - I still want to be a full time character animator - but its good enough for now).
A lot of it is setting those stepping stones. If you're in a full time job that has no creative outlet, maybe try side stepping to one that does, that gets you closer to your goals. If that isn't an option, commuting, lunch breaks and weekends are times I spend drawing in sketchbooks and practicing my character work for future ambitions.
We all find our ways, but I would say the best thing you can do is be flexible. Sometimes plans need to change and be altered, but that doesn't mean you're giving up. Also this is just MY experience, there are plenty of ways to tackle this sort of thing, and none are wrong as long as you're not ignoring your physical, mental, and finacial well being.