What are 'tuitions'? Are they study groups or individual private tutoring sessions after school?
I guess I'd feel kind of down and overwhelmed if I spent all day in school and then had to go right into more studying - but unfortunately - that's the way it seems to go these days.
How not to feel down about it...I guess I would just tell myself that it's a somewhat temporary situation (which it IS...although I know it can seem like a lifetime if you don't like school and depending on what year in school you're currently in), but just keep reminding yourself that applying yourself at this point will reap rewards later when you get older and have prepared yourself for any opportunity that presents itself by learning how to work hard and learn what you need to know.
Achievement becomes its own rewards - as does learning-for most people. I always felt really good and proud of myself when I worked hard and succeeded in learning new things (I still love to learn new stuff and get good at things- that never goes away really).
Science was intimidating to me too. I didn't think I was good at it, so I always approached it without confidence - intimidated from the very beginning and I regret this now - because I think if I'd approached it with more confidence, I could have done fine. Instead, as soon as I could stop taking science courses, I did..and I regret that now.
If you're good at learning other things - you're probably fine to learn science. Just believe you can do it.
Also, take time every day to play the piano. I read in your profile that's something you like to do. It's something I like to do to - and especially when I was a student - playing the piano everyday was a wonderful destresser. The music takes you to another place - you don't have to think - you're hands just do it..you need something like that to help you remember there are other important and wonderfully pleasurable aspects to your life in addition to the grind of studying.
If you're doing your best and you still need help, talk to your parents. Make sure they know you're trying, but that you feel that you still might need help.
Sometimes kids feel that they have to do it all alone and suffer in silence, and some kids don't have parents they can approach. But I think most parents just want to know the truth and will help in any way they can. But they can't help if they don't know what's going on or what the problem is.