God's utmost concern is what concerns us. If you belong to God, every need, every temptation and trial touching you, touched God because He is the Father and you are His daughter/son. Remember that God loves His sons/daughters because they are bone of His bones and flesh of His flesh.
As a child of God, He tells you to humbly cast on Him every single care and every single thoughts that makes you worried, anxious and upset.
On 1 Peter 5:6 and 7, it says to humble ourselves under the mighty hand of God and that He may exalt us at the proper time. It also says that we need to casts our anxieties because He truly cares for us.
God wants us to remember that we need to trust all our troubles in Him because He considers us precious, has value and purpose to Him.
In 1 Peter 5:7 it says, "Be of sober spirit." It means that we should not let our mind take us to places where we should not go and keep our thoughts under control. In 1 Peter 5:8, it says "Be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking someone to devour."
So, when you think that God never cares for you or that God already left you all alone full of problems, the devil ready to take over your mind and put some unnecessary things. Remember again: you are precious to God and that He is concern about you.
Continue to study about God by reading the Bible and keep seeking him daily. Give Him your future and casts all your worries and burdens to Him. He will keep His promises of better tomorrow.