Should I get a super different haircut?

I'm in high school and I have hair that goes down to my lower back. It's pretty long, and each morning I never have time to do it and I just put it in a messy pony tail and go to school. I don't really have time to brush through it and untangle it everyday, and it basically becomes a rats nest. I'm thinking about getting a bob because it'll be way easier to handle, and it'll probably grow out by the time I'm done with high school. But I'm still really doubtful. I don't know if I should cut all that hair off and I feel like I'll regret it later. Any advice?