Can I be truly honest?? I wonder..... and I stand corrected maybe, whether the question you are asking isnt the real issue here. To me, your question speaks of someone who places high priority on having a significant other and feeling inadequate because you havent/dont. Are we talking more about your own sense of self worth or esteem in that?
Hey, look at my age.....Im not married.....I've had one real relationship which ended 16 years ago.....I know what its like!
However, unless I find my contentment in all circumstances through my relationship with Jesus Christ, I will only find myself being needy of affirmation in a relationship and open to being susceptable to placing that person in the position that God should be in my life and if/when that happens everything turns to custard!!! Your 20, stop stressing and just be yourself, get out there with your friends, have fun and above all place your future in the Lords hands...he has great plans for you! Read: Jeremiah 29:11.
God bless