The first time we played in front of other people was at my mates 15th birthday when we were about the same age. We hired amps and a p.a. and thought we rocked the house. Looking back, we sucked and everyone was too wasted to care.
Our first pub gig was a couple of years later on a Friday night. The football game was on the big-screen so we were literally ignored.
Just hang in there - it all counts to experience and when you do play your dream show, it will be all the more worthwhile.