I made a rule for myself when I was young that I wasn't allowed to get married until I was 25. I didn't think I would be mature enough for it. You have to ask yourself some key questions.
can you wake up to the same person everyday and be happy
can you actually see yourself grow old with this person
do you truly love them and feel love in return
and ultimately what does your belly say (I call it the belly test), sit if you have to and meditate on it, work through the nerves and confusion to ask yourself, is this right for me. In that calm you WILL find your answer.
Best Wishes!