How do you do it?

Okay, this week (month) my problem is time management skills. I don't know how people do it. I have too much to do and not enough time to do it.
I am literally involved in at least a dozen different things. A short list:

-Jazz band, where we have three competitions coming up in the next month and a half. This takes two nights a week for rehearsal, as well as twice a week early morning rehearsal.

-Show Choir, one night a week rehearsal, once during school, and one early morning rehearsal a week.

-University of Iowa Honor Choir, which is next weekend. I literally spend most of my seminar (study hall) time rehearsing for this. as well as some after school time.

-concert band and concert choir, which I should practice for outside of school so I can perform my best.

-St. Ambrose University honor band, which is in one month. I landed first part on trombone, and I need to practice a LOT to perform as best as I possibly can for that concert.

and this is all on top of my family, girlfriend, school, and church demands that I am not necessarily meeting. Long story short, I'm full.
Why is it that we can't fit in everything we want to do? If we really, really love doing stuff, why can't it be easier to work in?
I declare that it is NOT FAIR.
Yes, I realize that I sound like a whiny teenager right now. Sorry for that. I'm just really frustrated realizing that I can't do everything I want. I love music, I love performing, I love my family, I love my girlfriend, I love my church. Why can't I balance all of the things I want to do?

I suppose it's God's way of requiring us to prioritize and decide what is most important to us. We have to be willing to let go of some things if we can't handle everything.
But I can't stand letting people down. If people are asking it of me, I want to do it for them.
So how can I manage to make everyone happy, and not explode at the same time?

I suppose that's my problem, I want to make everyone happy, and I also want to do too much. I need to learn to pass up on things that I can't handle, and also to accept the fact that I can't make everyone happy.
This is really, really hard to do. I think the only way I'm going to get through this next month is with a lot of assistance from God. Pray for me, if you're so inclined. I'm going to need the extra help. :)

God Bless You All.

Cody