The difference between “can” and “can’t” is the Cross. Look at the two words. Notice that letter at the end of “can’t”. See that letter “t” as the Cross of Jesus, the one where he proved to the world that even death has no say over us.
Take that “t” off. Take it and hold it close, put it into your heart. Remember the love that God has for you, love that caused God to send God’s only-begotten Son to you, to redeem you, to heal you, to show you the path of life. Carry Jesus with you into that thing you thought you couldn’t do.
In the church tradition I was raised in, when you were being baptized you were asked questions before you were dipped into the water. The answer to each of the questions is “I will, with God’s help.” Take the “t” off “can’t” and it becomes “can”. You can do it, with God’s help. Remember the exhortation from an apostle, who tells us “I can do everything through Christ who gives me strength.” Philippians 4:13