Starting up your own business is never easy especially in the
beginning. But then again, if starting up one's own business was
simple and stress free, everybody would be a business person.

Like what a lot of business people will say, you will likely fail a
few (or many) times before you succeed.
I know it sounds very cliched when I say this but whatever business
you are doing, make sure that you at least have an interest in it
or a passion to do it. I know that ultimately the bottomline is
that you need to make money from the business to survive. Heck,
everybody needs to eat. But with passion, it will at least give you
the determination and courage to push on and weather the storms
that come your way while you learn the ropes and become familiar
with the business until it becomes a viable source of income.
In my opinion, even if at the end of the day the business fails,
you lose a lot of money and you have to give it up, you will still
come out of it a better and more experienced person. It is an
experience nobody can take away from you. YOU CHOSE TO FOLLOW YOUR
HEART AND PASSION. Isn't that what life should be all about ?

What matters is that you are happy doing what you are doing. That
you are pursuing something that is, in your heart, worth pursuing.
Even if there are times when you are depressed from any problems
that arise from the business itself, take consolation to know that
even if you were working for somebody else in a firm, you will also
experience stress, albeit of a different nature. 
You want to be stressed about your own problems or stressed about
other people's problems ??? 
So whatever it is, always know why you are doing what you are
doing. 