Of course it is perfectly acceptable, try not to get yourself worked over something that will not even matter. You can still pleasure someone and be pleasured yourself, so no problem at all.
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I used to date a guy who was smaller than you, and OMG he was hot!! He knew exactly what to do with what he had.
My BF now is big --- it took me a long time to get comfortable with bottoming for him, and he still has to be careful with both anal and oral.
Relax, enjoy, count your blessings - in the past, my BF has had guys take one look and suddenly remember an urgent appointment lol -
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