Just make sure your ready to be tied down to one person , and give up the freedom to go and do as you please , to give up things like hanging out with you friends and taking trips with them and be prepared to change your ways and also you'll have to work harder cause you'll have more bills . Welcome to the real world !!!
Your not mentally prepared to commit in such a way until you are over 25 years. Your brain has not finished growing. Once you've reached that milestone it's a matter of how stable you and your partner are mentally, emotionally financially etc. If all of that is met, then you should try living together for a year or 2 before actually getting married. Whether you remain abstinent or not. Why rush something that should hopefully last a lifetime? Presumably waiting 1 or 2 years should be no time compared to the time you and your mate spend together.