It's not about introvert or extrovert. It's about how to put self under pressure. Taking it easy to the extent of being lazy is human nature. Why would one feel like to do anything if he has all his needs provided and desires satisfied? Cut yourself off from theses supplies and you're motivated to survive. If you cannot do the cut, have others do it for you. I feel like this all the time! I think for me, it's more the idea of doing something that entices me. But when I actually set out to do it, I realize it's not for me. I like the idea of going for a glamorous night out New Year's Eve, but when I arrive at the club I think no thanks. I like the idea of joining a gym but when I get there and see all the people who I'd have to work out in front of I think no thanks. I think I fall susceptible to this new idea of FOMO (fear of missing out) and sometimes think I have to be out doing social things or else I've somehow missed out on something. It's a common introvert dilemma.