As a fellow convert (who was reconciled to the Church about 25 years ago), I’d like to share what I see happening, CompSciGuy and John Mallory.
First of all, I believe you are misunderstanding what the Church is. She is, like her Lord and Head, both human and divine. This is most important to grasp, and grasp fully otherwise we make the mistake of judging things said and done by her leadership as either not living up to our ideas of perfection or of thinking she, in her humanity, can’t make mistakes. Either notion leads to confusion, as I see in you.
Secondly, many of us who came from Evangelical backgrounds came into the Church through much study and prayer. And that was good. Study is always good and so is prayer, of course. However, the mind set that we used can work against us because we are still “measuring” the Church against our own set of standards instead of letting her be herself, informing us of what we ought to understand/believe. It’s a subtle temptation we former Evangelicals most easily fall into.
As for fellowship, ministries can be one way to get involved, but sometimes a more prosaic means might be better for fellowshipping with other parishioners, making friends and getting known in the parish. Join those who clean the church or who serve meals or who sing for funerals, etc. There are always things that need to be done in any parish and volunteers are always needed.
No one can, in a single thread, sort out all your confusion and disheartenment. It takes time, sometimes a long time, to adjust to a new mind set/world view. In this many of remain Protestant even though we have been reconciled to the Church. Prayerfully, in humility and patience, let the Church teach you instead of you attempting to teach the Church. I think you’ll find yourselves far less unsettled and afraid. God bless you, you have my prayers. Please say one for me.