Sounds like you might be a bit overwhelmed on scene. But I must admit I have been there also. I started with a volunteer fire service while going through school to gain experience. When you get on scene of that medical emergency its like you have had absolutely no training at all!! My best advise would be to find experienced personal to respond with and watch, listen, and just observe while on a call. It takes much time, education, and experience to be able to practice medicine with the confidence you are looking for.
Good Luck!