These Barges are worth their 20m ISK. But you need some time to skill up to Industry V and Drone V to handle them, so carry on mining with a nicely fit Venture and find out if you like mining anyway.
I definitely know what you mean, in my first months in EVE I had no idea how getting rich could be as easy as all the dudes in the forum tell. But after a while, you learn different ways to play the game.
After 3 weeks in an Alpha clone I was convinced I carry on playing and I accepted an offer at the Buddy invites and rewards from other players and got enough PLEX to refill my wallet if ISK ran dry.