Aww I feel you man, honestly I do. I was at the exact same spot about 2 months ago. I joined discord about 1.5 month after joining steemit. Discord is a chatting forum like Skype but a lot different than that. A lot of Steemians are on it and you can easily find them there and have made their servers there where you can talk about different things and even promote your post after following certain rules. Download Discord by typing it on google. It is quite simple. Also to join a community, you'll need an invite from it which is usually available on a post by its creator on Steemit or the community blog on Steemit.