I had never ridden before but I said yes.
Why would you agree to do it?
I didn't want to tell my gf I was afraid of public transport.
Be honest with the people you care about. Otherwise these types of situations will occur again and leave you feeling ashamed.
I hear you.
I find it's best to be open about your fears so that you can face them head on. If you try to hide them they can end up dominating your life.