At the age of 20, you can choose love, because at your best age, love should be a necessity, not a slave to marriage. If you have love now, you should pursue it hard, because some people will never have real love again in their lifetime. It is not easy to meet true love. Everyone may be in college or working at the age of 20. No matter where, love always happens by accident. It comes when you don't expect it, but it may leave when you don't expect it.
I suggest you pursue your love bravely at the age of 20, because if you choose marriage at this time, you may be buried by marriage in the next few decades. People say that marriage is the grave of love, but it is not wrong. When you face marriage, you will face daily necessities. Even if you have love at this time, it won't last long, not to mention your marriage without love is even less happy! So you are still young, you should bravely choose love. When you are older, you can consider getting married.