https://www.youtube.com/watch?v=z3ECU6xtp68
Check out Ally Hills Coming Out Song.
As a Lesbian, here's what I think you should know. Decades after coming out to our parents, we all still talk about how they reacted. Bad reactions have negative repercussions for the future of the relationship - most mend, but a parent's reaction to coming out is never ever forgotten. When the conversations come up, no one ever says "it was so long ago, I hardly remember." It is a very big deal.
I hope you figure out your disappointment and get over it. As a parent, I don't understand it at all. But, you have a lot of company.