I have a couple of reasons...
1) I feel that I'm not where I see should be at my stage of life. In fact. I'm drastically behind what one would expect for my age.
2) Loneliness. I may have a few friends, and I've had relationships in the past, but forming and maintaining relationships with others has always been difficult for me.
This is probably due to the constant bullying I experienced throughout my school years, and later during the early years of employment.
There's also the emotional and physical abuse that I've a received from a past partner, as well the emotional & physical abuse, and the attempted smothering by my own mother.
Unfortunately, there's no other family in the picture because she has always kept me isolated from them and my father.
The only time my mother even communicates with me is to tell me how useless I am, put me down or to try and get more money from me.
This has all left me feeling anxious, depressed and finding little pleasure in life.