What's wrong with me??

i get sad really easily, and when i do i try to not cry so i make up excuses. but i just wanna let it out. it's wierd, but i wish i had a psychiatrist so i can tell someone about it. also i do this thing where i constantly roll my neck or squeeze my muscles in my neck and i stopped but then it came back again. i get canker sores all the time from always being stressed with homework and it makes me more mad because it hurts to eat. this is all jumbled up but i just wanna know what to do it's really frustrating.