C.S. LEWIS writes:
"I didn't go to religion to make me happy. I always knew a bottle of Port would do that. If you want a religion to make you feel really comfortable, I certainly don't recommend Christianity."
But then he also wrote:
"Though our feelings come and go, God's love for us does not."
For me, I have found it useful, as I read the Bible telling me I am not of this world, but go into it and preach the Gospel; to start from a premise of realizing I actually am just visiting earth even now, and I am from heaven coming to love people sincerely from that post, versus the post of living in the world, yet to struggle from not being of it.
You are a family member of God's by way of God's promise, as you have accepted Christ into your life, as your life; and as a family member, you are already apart of the Kingdom of God, so remember your mind can never be under your control unless you bring it there; there is no gift for control. You may pray till doomsday but your brain will never concentrate if you don't make it concentrate.
Lean not on your own understanding, but in all your ways acknowledge Him, and He will establish your paths, simply means when He says you are not going to hell, you are not going to hell, and when he says, be careful to live as you have been freed to do, then live towards God in that freedom. Be anxious about nothing.."Come to Me...and i will give you rest." Let God fight His spiritual warfares; as you must oblige Him in that stand. Simply rest in the love of God, and He will keep you in His rest as you stand against the enemies of God; the principalities and darkness of the spiritual realm. I pray this is encouraging...