That is the eternal question! I retired and thought I'd enjoy life, but my aging parents are taking a lot of my time! We all have something going on. It seems there is always drama. I'm not sure what all you have happening in your life, so it is really hard to give suggestions. We don't need the play-by-play, but a little more detail would help. Are you working to help support your parents and siblings? Enjoying the dating scene? what? There are usually ways to work around things. On-line classes might be one of them, so you can do school at times that works for you. But you would still need to set aside time to do your schoolwork! Please give us some more info!
Furthermore, making sure that you are getting enough sleep and eating right is very important in being proactive in stress management.