Answer:
Only you can tell. If you feel that you are ready to begin a committed relationship with one person and you are ready, willing and able to treat them the way you wish to be treated, then you are ready. Times differ for all people in all situations, but if you are worried that someone will judge you and say you've jumped in too soon, you shouldn't worry what other people say so long as you are confident with your choice. And if you are worried that you'll start the relationship and then figure out that you're not ready, you should talk to your partner about your feelings and tell them you want to take things slow.