Can a buddhist enjoy life - what are the limitations and restrictions I see many people telling that buddhism restricts the happiness of "gihi" (non clergy) life. What do you think? Does teaching in buddhism ask people to always think of uncertainty?
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Anyone who says that is misrepresenting Buddhism completely. The primary goal in Buddhism is the attainment of true happiness. The problem, of course, is that, according to Buddhism, no thing in the universe can bring such happiness. This is what is meant by the concept of uncertainty; not that we should always think  of it, but that it is a characteristic inherent in all arisen phenomena.

The good news is that by understanding this reality, we can find true and lasting happiness because we will no longer seek out happiness in that which cannot provide it. We will no longer face disappointment when that which we think of as stable turns out to be unstable; when that which we think of as satisfying turns out to be unsatisfying; and when that which we think of as controllable turns out to be out of our control.


  sabbe saṅkhārā aniccā”ti, yadā paññāya passati.
  atha nibbindati dukkhe, esa maggo visuddhiyā.
  
  All formations are impermanent. When one sees this with wisdom,
  thereupon becoming disenchanted with what is unsatisfying, this is the path of purification.
  
  -- Dhp. 277