The truth is that Jesus came to save sinners. The very thing that keeps us from seeing the truth is the thing that Jesus has come to save us from. Through the grace of God we are able to see the truth. If you have trouble seeing what is true, turn the trouble over to God. God is intent on helping you to the truth.
Miracles seem to be more frequent in people who relatively free from disbelief.
The other thing that keeps us from seeing the miracles around us is our sense of unworthiness. Now, have no doubt, we are unworthy. But Jesus didn't come to create a new round table full of worthy knights. Jesus came to save sinners by taking to himself all of our unworthiness. Somehow the Cross and Jesus' death on the Cross absorbs all of our sin and unworthiness.