Why sometimes our blessings seem a disaster for us?

There are times that what other people consider as blessing is not true for us who does receive it. It comes to a point like that when you feel that a good thing that happened to you has also caused a lot of bad things in return. Love can be a good example.
Love is indeed a blessing to everyone but then, once it enters your heart, confusion, commitment and extreme emotion follow. It can be such a wonderful thing for a moment but not forever. At a certain point, you will be experiencing sacrifice and pain. Surpassing all of those will still lead you anyway to happiness.
So, this question is not a big deal after all. A blessing is still a blessing and no matter what we have, we need to wholeheartedly accept it.