you should go.
just tell people with a big smile: yes, i'm single and i'm a catechumen.
and these are my lovely kids. they are quite a handful, but i love them!
i realise it may be hard for you, but you will find many kind people.
(as for the others... you are part of their education!)
in one coptic church i know, there are a few people who are not married (divorced, living with partner etc.) and who have children.
as far as i know the one (who is ethnic copt) living with his partner (as far as i know an atheist) and unmarried doesn't take Holy Communion but his little child does. he is friends with everyone, and one day he will get married / sort out his situation, but it doesn't prevent him from coming to church.
in another church, the (non coptic newly Christian) lady got baptised on the same day as her baby, and then a few days later married the baby's (coptic) father in church.
so, things that are not routine happen, and people in the church these days seem to have learnt how to deal with them without making things unpleasant for those concerned.
i hope and pray this will be true in your situation too.
also if you go to a week day service, there is likely to be much less gossip / strange looks than on a sunday.
it seems that people who go in the week go to pray.
MOST of the people who go on sundays also go to pray, but then there are also those that go to socialise / gossip etc.
the only disadvantage may be that in weekday services (in uk at least, don't know about usa), there is much less english in the liturgy, so you may want to take a service book if you have one (the guy who owns the projector probably only comes on sunday or saturday).
may God guide you and bless you, especially in this coming Holy Week