How do I start my own group for sharing pics?

That was EP. This mickey mouse site doesn't do that. Google plus suite has that feature but it costs to use it. There is also a site called Mewe that let's you create a community in a setting similar to this site to share your content. That site is free to use but like here has some premium features for sale. There is also reddit but I wouldn't recommend it as it has become like 4chan. There is always sites like instagram to do it as well.
Hopefully this information is helpful