Mental strength depends on the strength of the Moon in one's natal chart. You are ruled numerologically by the luminary Moon. You are moody at times and this depression generally saps your vitality. The best remedy for you is to take recourse to yogic practices to overcome depression. Have implicit faith in God.
Optimism is far better than pessimism.
Your inconstant nature makes you hesitant at times. You may lack self-assertion and become indecisive at times. If you wear a ring studded with Moonstone you can overcome the negative vibrations of this number. This ring should be worn on Monday of the bright fortnight after dedicating yourself to the Lord. Lunarians are generally timid and accomodative.