try a large project that takes about a month
Most people can whip up a 30 second short about nosense and stuff, but not many can do a large project. If you feel comfortable putting in 3 to 4 weeks of serious effort into something, then you will know if you are cut out to do this kind of stuff.
The hardest part is coming up with something to do, so I suggest you take a wacked-out nes game, draw it up by hand, and make a funny scene for all to enjoy. Something like "A Boy and his Blob:Strikes Back" or whatever. You know better than anyone as to what you want to do.
P.S. If you do my idea, put me in the credits as the concept designer.