So I'm in high-school (10th grade) and lately I get easier anxious in class or at least that how it feels. Lately whenever my class is being loud my heart starts beating faster and I feel like im going to cry (but don't bcs I somehow repress it and can't cry anymore) and I have trouble breathing. I don't show it that much and most people don't even notice.
For example today in French class we were making some exercises individually but everyone just kept talking and not really making the exercises but I dont really talk to my class bcs they all think I'm weird so I just kept making the exercises. But they kept being loud and the teacher didn't really stop them like usual and so after a while I started feeling more and more anxious till the end of class. Luckily it was the end of the day so I could just calm down on my own. I don't think anyone even noticed something was wrong bcs I just kept going making the exercises. 
Normally my class being loud wouldn't make me feel so anxious but lately it does and I don't know why. I felt this way before but then it got better but now I feel like this again and this has happend multiple times before only this time it's worse.

I just want all of it to stop and just leave everything because I don't want to do this anymore, having the hope it's getting better and then just ending up where I began. The only thing stopping me from killing myself right now is my family and best friends I love them too much to hurt them. Which kinda sucked bcs I feel like im in this endless loop of pain and a little hope that gets crushed. 

I'm not diagnosed with anything but from what I know I have signs of anxiety and depression.