I think I am currently suffering from severe depression but I have no idea why. It's not like I've had any real trauma in my life.
Do you think that something or someone around you might be causing your depression?
My mother suffers from a mental illness and I'm highly emotional, I respond very poorly to stress
Well it sounds like you might have found the cause and that'll help find the solution. From here you should go get some help since you're still depressed. A professional can do a great job of helping you solve the issue.
Nah. I don't want to involve anyone. I can solve it by myself.
Even though you think you can handle it yourself, don't you want to have a stable support group just in case something happens? Mental illnesses can be very unpredictable, and it would be really great to be safe like that to help you feel better.