When someone asks you to focus your mind on God, then you feel it difficult to do so, as there are SO MANY distracting things here in this world, and it's so difficult for the mind to reject them. Though we know that and feel that "Concentrating our mind on God is the only way to connect with our true nature and stop suffering" but still things of the world capture our mind & we are unable to divert our mind towards the God. But once we are able to get on to the road of God then we shall be thinking about Him more often. Though It's hard, but it's all the worth for the beauty, peace & happiness that it brings to your life. So just don't think that it is difficult to focus the mind on God, just try & you shall be able to concentrate your mind on God.
We generally have things of the world on our mind. These are our daily affairs, our family etc. which are on our mind most of the times. To have God on our mind or to be God minded, we need to develop love for God & need to understand that our own self (Soul) is a spark of the almighty consciousness. We need to understand that we all are a reflection of the Divine Light called God.
Our mind always wanders outside in this world & always goes about the objects of the senses. Our mind always loves things of this outside world, be it the beautiful scenery, music, scent etc . but does not normally find joy in things or songs related to God. Our mind always believes in visible things of this world & somehow believes with difficulty in someone, who is invisible, just like the God or Soul which is so subtle that it is invisible through our gross human eyes. Our mind rarely goes inside ourself & tries to find joy over there but always hankers in the outside world for the joy.
If we have have devotion to God, He shall always be on your mind. Lord Krishna says in the Bhagwat Gita
: Chapter Eight verse 14
yo mam smarati nityasah
tasyaham sulabhah partha
"Lord Sri Krishna says: Whosoever, always & constantly remembers Me with undivided mind; by that person, I am easy to obtain, O Arjuna, because of his constant engagement in the devotional service to Me."
So, let's have devotion towards God & then we shall always have "Peace of Mind". Let's divert the direction of our "Mind" towards the God who is sitting in our heart. It is the promise of the God in Bhagwat Gita that He shall welcome anyone who shall come to Him & He shall always protect that person.
Jai Shri Krishna