I understand perfectly the doubts that came with sharing your testimonials about God. We reluctant to share that deep part of us sometimes. Maybe out of fear of being judged or fear being ridiculed. Everyone has their own reason.
Personally, a constant reminder I always, always tell myself is “Sharing my testimony is not about me, is about glorifying God, increasing Him, and pray and hope that whoever hears it sees the glory of God, the glory of God alone and nothing else.”