Single or in a Relationship!???

There are times in life where we feel we could have more fun if we just switched sides between being single and being in love.There is this question that always comes up , is it better to be single or not?
Why does the other side always seem to have more fun ? It happens all the time .When you single people tell you how good it is to see someone and you will be happy.At the same time they tell you how nice it is to be single .People !!!!
And at that when you confused people around you are very happy  because they aint facing your dilemma. I know of people who will say just follow your heart ,if you wanna be single so be it till you get the guy who you feel is right for you but …l want to understand how relationships and being single work ???
Help