About learning:
There are lots of visual guides on youtube. For most people, that is at least more helpful than the big wall of texts, so they might be easier for you to work with, too

About your FC:
If they give sarcastic answers to your questions, they aren't exactly "newbie-friendly". Like most people suggested, try a different FC maybe.
In my experience, small, social FCs are a lot more helpful, patient and easy to get close to than big FCs that advertise themselves as "newbie-friendly". Those tend to be very...anonymous and all they provide is EXP buffs and stuff like that.

About cliques and the like:
One thing you have to realize is that people online are still real life people. When you get transfered to a new workplace or school, even if people are friendly and invite you to tag along and stuff, you WILL feel left out at times, because they have known each other for a long time already. They have inside jokes you don't understand, places they hang out at that you don't know about, etc.
It takes time to become part of that, and the most efficient way to do that is to be outgoing, talk to people, don't be shy to ask them things, to start a conversation, to have fun together.
You said you don't talk with anyone in your FC and feel left out - but conversation is key to get close to others in the first place, so maybe try changing your own behaviour a bit and see how it works out
After all, maybe your current FC isn't all that bad. But if you never socialize with them and all they ever see of you are rare requests for help (answering a question is some form of help too, btw), they might feel like you are only using them.