Yeah, I never really got the "bird pooping on you is good luck" thing; but since it happened, I'd say roll with it.
I am sure it took a lot of courage for you to come out to someone so important to you. Congratulations on being that strong.
Work with the therapist to figure out what is going on. I don't think I will ever know why I am trans (I have theories), so don't be surprised if you never figure it out yourself.
I think life is a gift, like a blank canvas. You have to figure out what to do with it, what to make of it, and in the end, it will probably mean different things to different people who look at it. But, hopefully it is beautiful (at least to you if no one else).