(This is going to be a long one, sorry
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I signed up for the school in June, made my introduction post and then pretty much just stuck to lurking because I felt that I wasn't cool/good/talented/whatever enough. This feeling didn't come from the school, but was very much something I had talked myself into. So what I would do is just do the lessons and that's it. With that I also fell into kind of a slump in my guitar playing. Because of everything that's going on it was basically just me, in my room, fumbling away and to be honest that didn't feel super satisfying. So instead of a daily thing, playing guitar just became more of a weekly or even monthly thing. Before I knew it it was December and I hadn't really been doing much for the last months.
So I started this year with the 'resolution' to become more active on the school, because while I was working my way through the lessons I realized that I was missing out on a huge chunk of the school by not utilizing the forums and checking out videos people had made and posting stuff of my own. This is a school, everybody is here to learn something and wants to help other learn things. Of course you don't have to go absolutely nuts like me and start an Instagram page where you upload daily videos of yourself playing. Once a week or month is fine as well. But I have discovered that this daily video thing is not only a way to 'force' myself to play daily, but also to document my progress as a guitarist. And what's cooler to look back in a week/month/year to see how far you've come?
So find something you are comfortable with talking about or showing off. It doesn't have to be something highly technical or deep. I think my first post was in the "What are you working on?"-topic, a great example of a question anybody has their own answer to and where there is no right or wrong. Same goes for videos: find a lesson you have completed, feel comfortable with and just film yourself playing along. It doesn't matter if it's Lesson 1 or if your video is only 30 seconds long and most of all it doesn't have to be perfect. Perfect videos are great, but showing your mistakes gives people the opportunity to give you advice and help you along. A perfect video (or one edited to look perfect) doesn't leave much room to comment anything but "sounds great", but a mistake gives people a concrete point to guide you and give you pointers.
Basically what I am saying comes down to: Start small with something you feel good about and start interacting with others on topics you feel comfortable with. You'll find people are super supportive and helpful and eventually you'll feel comfortable enough posting something that maybe you aren't so sure about. And this is where the good stuff starts happening