well my MTB is a fairly obcene amount of cash but I absolutly love it, im rapid downhill (comparativly) , ive been riding ten years and its developed over time, so no embarasment there
However: just starting in road biking and just got a £1800 cannondale race bike, i want to join a club but im going to make sure I do a good few months riding before joining so i dont make a complete fool of myself, so maybe yes i would be embarssed rocking up in front of others on a carbon race bike the first time ive ever ridden on road