Dracula, if you think you might have a mental illness, the best thing you can do is go to your family doctor, explain how your feelings are affecting you, and ask for a referral to a licensed psychologist or a psychiatrist.
I think a horoscope show certain energies, but not a biography of the individual.
Mercury in a chart shows our thought processes, and yours is conjunct Saturn and Pluto. This can suggest someone whose thinking is frustrated and unhappy, (Saturn) together with a volcano kind of energy (Pluto) that normally simmers below the surface, then erupts. You also have the war god planet Mars (assertiveness, masculinity in a man's chart) conjunct Uranus, a planet of sudden change. This also makes me think you might be prone to sudden (Uranus) outbursts of anger (Mars). With your Mars/Uranus in a challenging aspect to Venus (what you look for in a woman) I wonder if your anger gets directed towards your wife if you are married, or towards women more generally.
These planets are clustered around your MC, or cusp of your 10th house of career. So you might feel especially frustrated in matters concerning your career. This cusp can also symbolize one's mother, so it is possible that she is a source of frustration for you, especially with your Moon square Jupiter.
With Neptune (the sea god, who dissolves what he touches) challenging your sun (your identity), you may find it difficult to maintain your sense of self-esteem, and easy to feel discouraged.
So none of this means that you have a mental illness or not. But if you feel so unhappy, by all means, visit some health care professionals who can help you.