I find your question very interesting.The reason being
i had asked the same question many times.It is often a
question we need to ask before embarking on this journey
of life.
There are many good organisations like ISKCON.One of them is
Divine Life Society.This article is a very enlightening article.Maybe this will answer your question.
http://www.sivanandadlshq.org/religions/relkrishna.htm