As a recent convert attending a Greek Orthodox parish, I can relate. I've only attended two different Orthodox churches, both of which are Greek and I attend the one that is the most "ethnic". There are far fewer converts where I attend, the liturgy is about 50% Greek, and the chattering at coffee hour is mostly in Greek.
When I first started attending, I was told there might be some who aren't as friendly to converts, but I honestly haven't noticed them. The priest told me early on not to be discouraged if I should encounter any that aren't accepting of us. He said to stake my claim and I had as much right to be there as they did. As someone who has never attended an Orthodox church in the 30+ years that I've considered myself a Christian, I can tell you that it was a tad intimidating in the beginning. I could tell you a few stories of friendly Greeks at my parish, but that doesn't really help you where you're at. I'm sure there are churches that are super friendly as well as those that aren't. What I will tell you, is that when I made the decision to convert, it wasn't based on how friendly the church was, although I know how much that can play a part in one's life. So, if there are some who aren't exactly thrilled that I'm there, that's their issue, not mine. I'm there to worship and that's what I do. Fortunately, there are books in the pews that have the liturgy written in Greek and English so I can follow along even when I don't fully understand what is being said. I can still worship. I've also learned some Greek and I think they appreciate that I'm making that attempt.
I do feel for you if you're struggling to find friendly people though. It helps to have a community around you, to walk with you through life's valleys and celebrate life's peaks. I've had that at every other church I've attended and we were very much involved in each others lives. So what am I to do now? If I want friends, be friendly. Not everyone will connect with me, but the friendlier I am towards others, regardless of their response, the greater the chance of befriending someone. All it takes is one and then it snowballs, but you've got to put yourself out there. As cliche' as it sounds, don't focus on the potential negative, anticipate the positive and you'll likely find what you're looking for.