Wedding planning

Growing up I thought that I knew all that I wanted my wedding to be. Now that I am actually an adult having a horse drawn carriage and a big catholic church sounds pretty crazy.....I mean I am not even catholic.
The wedding is over a year away and already I know why people elope. There is so much to do and so little money. It certainly isn't TIME I am worried about, got plenty of that. Tons of time to think about flowers and cheese plater and tons more to change my mind about what the heck I actually want. Am I really old enough to get married. Isn't there some sort of test I am suppose to take to show that I am mature enough for this?
Which brings me to a whole other subject, what is it with all these people getting married? We already have 3 weddings to go to this year and these are all people that I grew up with. Did they pass the test? If they did then I know that I shouldn't have a problem.