Should I go back to School?

I have been working with my dad for over 3 years,the problem is that he wants me to go back to school in August but I have to many task/responsibilities and have to watch a million of things and no one knows how to do them.i want him to hire someone else so I can focus on school but I doubt he wants to.Lately because of this ,I have been very snappy and upset and do not want to talk to anyone.he knows why I am like this and my siblings feels the same.School is in like 2 weeks and do not feel like I am ready at all.Also money I am making only less than $500 a month and the rest is going to my car payment so I am not making much like I did for the beginning.2nd I took another job and now will have to work around that)l(need the job because my dad pays hourly.so I will not be able to put enough hours in to pay car payment so I will need a night job to compensate)I just don’t know what to do or if this is the right step right now.my brother just got out high school and he is a tech he will not be able to handle all these things at his age.i am 21 by the way.Cant even go out with getting called about something I need to do.Should he hire someone else?school needs to come first for me really.money is tight also.and it is making me subconsciously stressed