I did this and priests were understanding and very helpful, he helped me meet someone for a Godfather and they were all very friendly and nice, I never acted like a normal human and was open about my background with my priest/Godfather
Just be honest, dont tell everyone of course but you aren't really forced into much social interaction anyway
but you'll have to attend mass a while before you need to worry about any of that, if you just go in you dont need to worry about anyhting. If you are worried email the priest and he should help you out and give you some guidance.