Just take Cindy's advice, I took the plunge 4 years ago and have now done 8 with 2 more booked for this year. Had some great experiences and am looking forward to even more travelling, not had a bad trip yet, my tip is just book it and if you're a bit nervous about introducing yourself, just make sure your just you luggage tag is on show on your hand luggage for when you check in / go to the exec lounge, there are always people in the group that will spot it and introduce themselves to you and make you feel welcome.