Galaxy Big Band practice and next plan

Yesterday, I had the Galaxy Jazz band practice at Yamaha building. I started at 2.30pm in the afternoon until 8pm at night. Honestly, I thought yesterday's practice was very frustrating. At first, I thought that the practice was going to end at 6pm. However it was somehow extended to 7pm. Later on I found out that there is a saxophone mini band practice and that I was in it (because I play the saxophone in the band). I was stressing out because I was hungry and exhausted. 

I may sound like a negative student but I actually have reasons to this. I was in this band when I was in 6th grade and I've been playing for one year. After that I took a break because I've been very busy the whole time. So I joined again now in 11th grade for my CAS. Everything changed so much. First, the leader of the band and the community was changed. I can't really get along well with the new people although I tried to socialize with them. The system has changed, we need to download scores and print them by ourselves which is hard for me to do because there are tons of scores to download and I get confused which one is which (there are too many parts such as trumpet, trombone, woodwind, etc.) Also, I think the practice time is too long (4-5 hours every practice). I tried my self to think positively and to motivate my self being in the band but I always fail. I am strongly thinking of changing this activity after one more concert at Barcode in Kemang (May 22). 

I might want to learn Aikido (Japanese Taekwondo) for my action activity. And I would like to focus my service activity after the summer break. I will go to the small elementary school next to my school and teach kids about interesting things such as crafts, global warming, manners and behaviors, little bit of language, music, art and so on. I would do this for three months.