As per (Bhagwat Gita: Chapter Six verse 34) :
"chanchalam hi manah krishna
pramathi balavad drdham
tasyaham nigraham manye
"Arjuna said to Lord Sri Krishna: For the mind is restless, turbulent, obstinate and very strong, O Krishna, and to subdue it, to control it, I think, is more difficult than controlling the wind."
mano durnigraham chalam
abhyasena tu kaunteya
"Lord Sri Krishna said: O mighty-armed Arjuna, it is undoubtedly that mind is very difficult to curb & is restless, but it is possible to control it by suitable practices of meditation and by detachment."
So as per above verses, mind is restless, turbulent, obstinate and very strong but still it can be controlled by suitable practices of meditation, detachment & devotion to God. So let's read teachings of Bhagavat-Gita & understand how to keep our emotions & mind under control. Once there is balance of Emotions and Intellect in human mind then you shall always lead a peaceful & happy life.
Jai Shri Krishna