Just do that whenever you're ready and not because your friends
around your age are already married.
Before you get married, ask yourself and your partner if you
understand what a marriage is all about? It's not about sex all the
time. It's not like fairy tales -always happily ever after. Every
good and loving relationship has its ups and downs and has its
challenges. No one would have any problem with the ups but are you
ready for the "downs" and challenges together? Are you ready to
work things through no matter how hard they are, just to make the
marriage stay strong?
Marriage is about love and long term commitment. Are you ready for
this long term commitment?
Can you (& your partner) afford financially (housing, food,
other living expenses etc) to get married without help from your
parents? Money is one of the main cause of many divorces nowadays
so take note of that.
Have you ever discussed or worked out a plan to share the household
expenses after you're married? In today's society, don't expect the
male to pay for everything while you save your money for yourself.
Are you two willing to discuss or seek permission from each other
whenever one of you want to buy something expensive? I know many
people have the mentality that "I can spend all I want since it's
my hard-earned money" but remember when you're married, you've
become one and everything you do, you will tend to affect your
partner too especially if both of you want to have a more
comfortable life.
Children? Do you both want children? How many do you want and how
soon do you want it? The method of contraception? If both of you
have similar ideas, that'd be fine but if both of you have
different ideas, that gives you the opportunity to work it out (to
do some compromises) and perhaps consider if you're right for each
other. It's better to talk about these things first to avoid
argument after you are married.
There are so many things that you need to aware of before you tie
the knot. Never go into a marriage expecting that you can change
the person. Also, you'll need just as much effort to maintain a
good, loving relationship after you are married as you're
dating.
I hope all these tips would help you to know what to expect in a
marriage. I would strongly recommend you and your partner to attend
premarital counselling if possible. They are very helpful.
All the best! 
