do you mean you don't want to compete or don't want to spar?
Like boxer says it would depend on the gym.
But, if you don't want to compete just tell them just that. I only competed inter club sparing for rounds I never wanted to commit to the trianing, travelling and stuff that comes along with competing in the amatures.
Pro boxing is very tempting tho mate as you get paid for your troubles, a quick £250 can be made in 3 - 2min rounds at local level.
If you don't even want to spar, to be honest that probably will be frowned upon.
If you like your nose the way it is, parry and duck.
Don't be worried about sparring, you'll like it when you get in there...
it's not like the fights outside the school gates where the confrontation itself made you feel sick, you will nearly always get nervous but that instead of feeling like fear, it gets channeled into exitment and energy and most importantly pain relief.
You can not avoid the pain BTW, getting hit hurts.
Try it mate, you will not regret it I promise you.