I want to make a manga, but...?

try buying Manga Studio when you get the chance, really good computer program,

or, you don't have to make it right away, just write it when your ready,

friends aren't interested? that's their problem, let them know when it's ready, and ask them to read it and see what they think.

hope I helped!

Yes draw for fun, and go onine to a artist page community or something and talk with others that share your interest. I think Deviant Art is one of those, and so is Pixiv.