Hi, nice to meet you! Bouldering is rock climbing, but closer to the ground and without ropes/harnesses. You can do it inside on artificial walls with changeable routes or "problems", or outside on actual boulders. I don't have very many outside spots available near me, so it's easier to just go to a gym. The Parks Authority in my state also has three free bouldering walls set up underneath a section of highway by the river. It's quite nice to head over there and muck around without needing to pay admission! Completely agree about the relaxing side of things. It's very meditative. Just me and the wall! And as far as being rubbish at it... in the immortal words of Jake the Dog "Suckin' at something is the first step towards being sorta good at something".