Personally, I myself feel nervous and uneasy on commercial flights. It doesn't help that any of the elegance and glamour that commercial air travel once had is completely missing today what with the "cram-em-in" cabins and invasive and humiliating security checks one is occasionally submitted to. I've been aviation mad as long as I can remember but was 28 when I finally managed to take my first glider lesson. I involuntarily closed my eyes when we hit little patches of sink on tow (and the reduced G was really no worse than that in an elevator starting down) but asked the instructor to do a sharp stall and found I could handle it. By the time we got to doing full spins in the Blanik I was absolutely loving everything about flying. I remember wishing I could do spins more because A: they were fun and B: unlike the circuit and landing they were pretty simple to perform. That was 1998. I've got nearly 1300 hours now and just came down from a great wave flight in an ASW-15B where I repeatedly got to 12,500" (limited by airspace where I fly) and was having a blast running at near maneuvering speed for long straight glides north, south, east and west of the home field. I've only had the opportunity to take a winch launch once but I actually found it a thoroughly enjoyable experience.

I can't guarantee that you will have as little trouble with nervousness as I did once I actually got into soaring for real but there's certainly a very good chance that you'll be fine. Just remember that soaring can easily turn into an addiction or obsession so be prepared to spend a lot of time - and money - doing it. If you live in an area where there is a definite "soaring season" and they don't fly for the four or five winter months be prepared for withdrawal symptoms unless you're well off enough to travel to somewhere where they do operate during that time period. Man, I wish I had enough money to spend my winters in Omarama!