"Cast me not away from your presence; and take not your holy spirit from me. Restore unto me the joy of your salvation; and uphold me with your free spirit." (Psalm 51:11-12)
If you believe you can, you probably can.
If you believe you won't, you most assuredly won't.
Belief [faith] is the ignition switch that gets you off the launching pad.
"Therefore the ungodly shall not stand in the judgment, nor sinners in the congregation of the righteous. For the Lord knows the way of the righteous: but the way of the ungodly shall perish."(Psalm 1:5-7)