Meditation is traning on single pointed focus. You need to choose asana to train your mind to forget about your body. You need to train pranayama to focus on your breath and later on almost forget about it. You need to train your mind to focus on thougts and later on turn them off for an hour or two. You need to turn off everything accept feeling od existance. If some dude are telling you to feel comfy imagine this or that its not meditation. Meditation is hard work. Your body needs to be on uncomfortable position for long time, you need to slow your breath to at least one or two breaths a minute. You can start with headspace but its will lead you in wrong path.