Sensitivity,crush,and low grades.Help?

Okay,I'm extremely sensitive to some things.I'm in HS,and when I got an F,I broke down in tears.My classmates are always mean and teasing me(even girls!I just couldn't believe..) and treating me like an idiot.I cry alot,and for that reason,they tend to tease me even more.People keep telling me to ignore them but I can't no matter what I do!I sometimes reply when I have a good comeback but they still think it's funny to tease me.
I'm also bad at Spanish(It's a language High School in Bulgaria).I get F's alot,because the teacher tests our knowledge by dictating spanish words/bulgarian words,and telling us to translate,but I barely even answer 5,(they are always 10),so I get F's..alot other people in my class do,but I want to be a little better.Getting a tutor is not an option.
I really try my best but I can't memorise the goddamn words.I listen to relaxing music,(even sing),relax every ten minutes,but EVERY freaking time,there are words that I don't remember studying or writing down in my notebook.The worst thing is,she expects us to learn them somehow,from somewhere.I don't have a freaking dictionary with myself.
Also,I have a crush from my Middle School.He is not in my High School.He's kind,somewhat sarcastic sometimes,extremely smart(he got the highest grades when we did tests,except for english,I got the highests ones in english) and polite.I almost always invite him to my birthday parties,and if I'm unable,he calls me to tell me "Happy Birthday"personally.I find him rather attractive.We're very good friends(not best,but very good),and we used to talk about 1-2 hours on skype for a few days,it was fun.He even called me when I was sick of an illness (Hepatite B) and in the hospital,wished me well,and kept the convo for about 13 minutes.
I'm sure he might like me,but I can't build up the courage to tell him I like him.We sometimes chat on Skype,but only exchange a few words,and it's awkward,and we go back to what we were doing in the first place.I'm a bit shy.(But not really)
How do I tell him I like him?How do I get higher grades?(Just to mention that I did try online lessons,they helped alot at some point,but...)And how do I make my classmates believe that I don't care about what they do,and that they should fuck off?
Answers will be much appreciated.
~Alice

Never gonna give you up, never gonna let you down, never gonna run around and hurt you!

you just made me cry listening to your story. okay so bullies suck, they do and I know because i've been bullied. and all their gonna be is mean and heartless, they'll grow up and have no friends and thats it. okay so I know your a little shy (and im pretty shy myself) but if you want bullies out of the way you need to stand up. just go up to one or a main one and tell them how freggin stupid their making your life. and if they dont listen to you or you dont have the courage. leave a note and stick it in their locker, or book or something. somewhere where they will secretly see it and they dont even have to know it was you. now for grades I have some study tips and I will comment on this answer with them so that will hopefully help. for your friend who you like. stay friends and be thankful for him. its wonderful that you have a friend that cares, and also you are able to see him and he likes you (at least as a friend) and he cares about you. I hope this helps and I wish you the best in life
-Emily <3

well first of all about grades I would reccomend getting friends and that boy(if he is availible) on a study date but about getting confessing well.. thats harder um maybe if you are really shy just blurt it out when you guys are talking or if you havta leave and maybey try to gather info if he likes you like getting friends to ask him if he does. And for bullies just tell a teacher/parent/gaurdian or just ignore them