Is it okay to be nervous?

I get about 2-3 massages each year because I really enjoy them and they are very relaxing. Well, the massage therapist I normally go to stopped doing them, which I am disappointed.

I have been to different massage therapist since she quit, but I haven't found one I really like.

I am scheduled to go to another new one in a month and I am kind of nervous. She has only been a massage therapist for about 9 months, so she is young. I am nervous because I am afraid I am going to get a boner. Quite often, when I get massages, I get a boner and I don't know why. Is that bad? What will this young new massage therapist will think or do if I get one when she is giving me a massage?