Man I wish I could give better help than this but..
First time I went to a martial arts place (karate) I was like 7 and I was with my mom. Got on pretty well there for 2ish years before the place closed down.
Next time I stepped into a gym (boxing) I was 12, with my mom again. But this time I was even more nervous. The owner was this big built guy with a beard and all the guys there were like 3-6 years older than me at least. Very nervous and my mom just left me there. Everyone was very nice and understanding that I was new. Just a couple weeks in I knew everyone by name and got to know some of the other guys closer to my age. Man 6 months in, that gym was home. I stopped boxing regularly almost 4 years ago but I could walk back in there today and be home.
I started college when I was 17, was into starting and trying new things. I started going to a kickboxing gym. This time I was more easy going on my way in, had the air of confidence in myself and in that I already had a good start on anything they had to teach me regarding my hands. But the first time in class, I accidentally trip my partner while we were doing cardio and then I poked him in the eye shortly after. It was pretty nerve racking.
Lot of text, but my point is that you're going to be nervous at first but it will pass. Keep an open mind and try to relax and have fun. We all feel this, but its how we deal with it thats important.
If a law is unjust, a man is not only right to disobey it, he is obligated to do so. ~ Thomas Jefferson
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