focus of mind

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i have been always thinking on how to make my mind focused whether it is a work or study or listening to someone speaking or even listening a songs. i feel myself active in listening to whatever it just for a few minutes and sfter that i start yawning which i believe is not a good sing to do so. i feel that my mind is not focused and as per the suggestions of my friends i started meditating in which a lot of images came to my mind. i don't know how can i just not see them and hence i have stopped meditating as well. and now i feel very much tensed. i don't like to be in a crowd and noisy places even in the markets. perhaps you have understood what i wanted to say. please help me in this context...