If you say to yourself that you are a believer in Christ but having difficulties to believe in miracles through Him, it’s just a sign how you have made your relationship with Him as Your Saviour, Provider, Deliverer and as The Sovereign God.
If you live your life as a Christian is separated from God’s miracles, it means you have lived your christian life conform to the standard of this world, apart from the presence of the Living God Who is the miracle itself.