For me, It was joining a guild that was planning to raid times that worked for me (whether thats 2 days 3 days etc.) I can get shy, so I looked for smaller guilds that emphasized friendliness personally.
I found a wonderful one at the beginning of the xpac, but then they stopped raiding after AOTC. But I made a great group of friends from there, and now we have our own guild!
This is our posting - youre welcome to come play with us!