One of the most important things you can have is an accountability partner--someone you trust and respect who loves you but doesn't have a problem telling you when you're off track. Most successful people have accountability partners and it's an invaluable asset. And it can make you a better speaker.
Have that trusted friend (or professional advisor) stop by a practice session or witness your presentation...and ask them to give you a constructive critique. What worked and what didn't and why. Things they heard the audience say afterwards. (It's great to have a friend hanging around, overhearing conversations about your performance. My wife loves to go to my shows and anonymously hear people complimenting my stuff!)
That witness can help you smooth out the rough spots and, better yet, praise you for the things that shine in your speech. You'll find your performance will improve dramatically!