that isnt your weakness, you're just a serious introvert who enjoys "contemplation"- nothing wrong with that
Maybe a bit less meditating and a bit more shagging?
in what kind of situations do you find that you are being "too serious"? i have some thoughts on this myself, and have had a similar feeling before, but oftentimes it is actually other people who are way too serious, only they do not realise how utterly terrifyingly serious they are, because their priorities are all twisted around backwards. they see everything that is actually serious in life as being a joke that they can stomp over, and they treat everything trite and unreal as being utterly deadpan serious. frankly this does not leave a lot of room for real, good-natured humour.
Stop being so freaking serious!