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This problem can only be solved through continuous practice. It happens in the beginning and its difficult to hold your mind for the purpose of meditation but this problem persists for a very short period.

You have keep yourself focus to the method and posture at the beginning then as the time passes out, you will become comfortable with that and will enjoy peace of mind.

Mind's natural tendency is to seek pleasure. It cannot withstand disappointments of its desires and when one desire is not fulfilled it feels sorrow resulting in pain. Thus, gradually, a man finds himself burdened with many pains which remain ingrained in the mind.
Along with this, all the actions and all the scenes, such as what one has heard, one has seen, one has touched, one has smelt and tasted also remain in the mind as impressions. Some may remain permanently in the mind just like in a hard disc in a computer. Others will remain as temporary files in the computer and get automatically erased.
When a person sits for meditation, all these impressions remaining in the mind start appearing before the person. This creates a hindrance in concentration.

this article is full of great knowledge and one should apply this great knowledge in their lives. you should do regular meditation to keep your mind healthy.