I'm 21, and feel way over 40. At least that is what mom says the age is like when i describe my mind and feelings. I'm under a lot of stress, it makes me feel mentally and emotionally tired and weary. I feel like i've lived a long ass life of some pretty rough shit, even though i'm pretty young. I've had a lot of trouble in life, very little of which was my fault, but it puts its toll on your mind and emotions.
I suggest always enjoying your teen years. I never was able to experience that, besides the bad aspects. I was always pushed into acting older than i should have been. No one should have their right to be a normal age taken away from them. It makes you feel like you're ancient in the mind. And in my case, the body.