wasting time complaining

i do not understand how people live actual busy lives.
i have classes, a job where i can do my homework, a job once a week where i can't, and i find it hard to do anywhere near as much as i'd like to.
i've heard before that people tend to find more time for more things when they're busier, and i think that might be true. i feel like i was more productive last semester when i had more classes.
there are just so many things that can be done. spending time with friends, spending time with a girlfriend, exercising, reading, writing, homework, listening to music, trying to play music, eating, drinking, sleeping. and those are just the things i'd like to do every day, not to mention things to do on special occasions or every so often or weekly or whatnot.
i suppose it's better to make the best of time all the time instead of complaining though.