Welcome and can I say how proud I am of you? It is not easy to share a painful feeling, let alone to say how horrible your day has been and that it reduced you to cry in class, that is tough. I am so glad you have reached out here for some comfort and some support and someone to sit with you.
I am a parent too, my son is 16 and my daughter is 13, so while I don't know what it is like to be a teen these days, I know it is so much harder than when I was your age. I don't know why, technology? access to too much information? I don't know but I can see the pressures, from friends, from school, from society and from us as parents and it is alot.
This is a safe space for you to share how you are feeling, to get it out and to get some hope and some light to shine on your day.
I am sure that your parents are doing the best that they can with what they know, for you though and maybe your sister too they are not able to help in the matter of mental health, and that is fine, we need to get you some help and to find someone that is able to help. Sophie_M has given you some great resources in KidsHelp Line and Headspace, who are so brilliant, I cannot express how wonderful they are and that might be a great start.
Also, and I don't know how you will feel about this but a trip to the GP might be in order too, to have a chat and to check you out, to see if you need some extra help or support from them.
We are here for you cjcj5, and well done for reaching out tonight.
I am here to chat, to listen and to let you know you are not alone.