welcome to health care magic forum,
Who said that you have weak mind power? you thought that you have weak mental power and you confirmed it !
Do not feel inferiority complex
,develop self confidence.
Mental power is relative term and so do not confuse.
You cultivate your mind and give some mental exercise to brain.
See tv channel give more information,question answers and debate.
Read books of lives of big celebrities and know about ups and downs came in their lives.
No medicines,Alopathy or herbal will you give high mental power.
Do healthy exercises and Yogas.