Nothing embarrassing or to be ashamed of at all. You'd be surprised how many people are in the same boat. I was very fortunate myself to stumble across a guild purely for players with social anxiety 9 years ago in WoW which made all the difference and is a big reason I still play MMO's and have come as far as I have. We're still around and branched out into ff14 a few years back, have beaten every EX and are dipping into Savage next week.
I'd give FC's another go, even just having company can break the loneliness. It's quite possible there are FC's aimed towards those with anxiety on your data-center, or even just a friendly group you find you click with.
Can understand what you mean with openers on guides or Party Finder descriptions. It makes little sense to me first time too. Guides in particular are aimed towards experienced Savage players who are optimizing their gameplay. The majority of players are not glancing at a class guide, seeing a 30 step opener, going "cool, got it" and pulling it off flawlessly on every boss after. Most players rotations are all over the place. It's normal, we aren't machines.
Party Finder ...well, PF is PF. A lot of people turn up and don't know what the description means exactly and just try to wing it and pick it up along the way. A nice FC group is a much better place to start out though. Some practice groups will explain, but Party Finder is often a mess where no one wants to discuss strats or work as a team.
I'd recommend working up the courage to give the guy at work a poke ingame. It's scary, but who knows where it might lead. You have to take that first step to get there.
Hope things work out though, take care.
