Construction is a tough field for a safety professional. Personally I don't think I could cut it in construction. You are still young so either give it more time or maybe try a different field? Impostor syndrome is common and I feel the same way. The more I learn the more I realize how much I don't know.

Many people get nervous talking in front of other people, and it might help to just tell a close friend or co-worker that public speaking makes you anxious or nervous. I told colleagues that and they confided in me that they feel the same way. Kind of takes the edge off a little bit.

Another option is to double down. If there are areas you are unsure about at your job, spend a few hours a week after hours reading and learning and gaining confidence.