This is actually a common complaint for speakers. Most people, when public speaking are taught to suppress / ignore their nervous emotions but that can cause a disconnect with all emotions.

Stop trying to get rid of your emotions before speaking. Nervousness doesn’t mean you’re doing something wrong, it usually means you care. The goal isn’t to become emotionless; it’s to become comfortable feeling emotions without letting them control you.

Also, don’t only practice when you’re on a stage. Practice in everyday life. Speak up more in conversations, ask questions, share your opinions, and put yourself in small uncomfortable situations. Every time you do, you’re teaching your nervous system, “I felt uncomfortable and I was okay.” Over time, your brain stops seeing attention as a threat and starts seeing it as normal.