Paralysis while being alive is one of the worst experiences. I'm not speaking of the medical kind but more of the growth and development as a person.
Thinking inward and meditation are necessary. But doing it too much to the extent of spending most of your time looking for your purpose is not healthy. If you keep on doing that, you might not get to the answer. And without noticing it, it's already the end of you.
If you haven't found your purpose, you can always create one. You'll never go wrong in building your life for a purpose of helping another life. You'll never lose anything but you'll gain more in reaching out to people around you. Most of the time, you don't really have to seek for the purpose as you just need to act on it as it is has been beside you all this time.