Trying to cope with work, being a student and taking care of home

I have to say that when I first started my online classes, I was not working and I just felt like time was lost. After a while it was fun and very challenging when I went back to school. I try to take care of me first but that never seems to happen, because someone always need me to do something for them...I'm suppose to say no and do what Lisa needs to do but I'm that type of person that just can't say No! Eventhough I work part-time it doesn't seem like enough hours in a day to get all that I need done.