I know what you mean Albert. Training one's nerves and adrenaline is a fine art. Some people suffer more than others but it's something that affects many of even the best performers.
When I perform for certain friends I feel zero pressure, and as a result get little to no nerves. But performing for strangers I do sometimes get nerves and adrenaline that is hard to control and can make tough moves harder to perform well etc. I think the key to this is to realise that the only difference here is not actually WHO I am performing for, but how
I am mentally preparing myself. By taking that approach I take when performing for friends; that mentality and state of mind; and basically pretending that this is exactly the same when I am performing for strangers, I can essentially fool myself into performing with much less nerves and feelings of pressure. I think this is key in mastering ones nerves/adrenaline. The pressure that causes nerves is coming from inside myself, not from the spectators. All our reactions to things are self taught. Just as one can self-cure, for instance, a phobia, one can also completely re-wire one's responses to other things