Happiness is an illusion.

Yes, happiness is an illusion.  Instead, strive for contentment.  Life will always have challenges and misery will come and go.  Always questioning, "why can't I be happy?" will only bring more misery.  It doesn't matter what religion you follow or non at all, life will always throw you 'curve balls' and when it does your choices of how to react will create the best and easiest outcome, not the god you pray too.  Some religions believe 'karma' has something to do with why misery comes to us and others believe 'its just gods way'.  Whatever you believe, it is how you react that is the key.
'Contentment' in life is what we should strive for.  Blaming others is another bad habit some fall into.
It doesn't matter if your begging on the street or driving a Ferrari to your next big money making job, misery can come and striving for happiness too much can again bring more misery.

Wake up with gratitude for what you have.  Smile at people and show compassion for them.  Strive to not take on their 'miseries'.  We will bring ourselves down if we try to cease all others' miseries and solve their 'perceived' problems.

It can be helpful to become a little detached from others' miseries.  This sounds like you don't care, however overly sensitive people need to do this sometimes for their own well-being.  Show them compassion as they sometimes know no better than to wallow in their misery, but protect yourself from being swallowed up by it as often another misery is just around the corner for them in their 'reality' and difficulty due to striving for happiness.
I will speak more on this in the coming weeks.  In the meantime, meditate or just quietly contemplate these ideas when you have a quiet moment.

Peace be with you,

Tracey.