How to commit to a relationship
Ask yourself what you're feeling. Identifying feelings about the relationship should be the first thing you do to figure out if you're ready to totally and completely commit yourself to the relationship. Take some time and write down your feelings and identify how you're feeling and why you're feeling that way.
Talk to family members and friends. Getting opinions from the people who love you and care about you about the relationship is crucial to deciding if you're ready to commit to a relationship. What your family and friends think about the relationship is important to deciding if this really is the person for you to be exclusive with.
Does your significant other feel the same as you do? Talk to them and ask them what they're feeling. Have "the talk" about commitment and what each of you thinks that word means. It's important to be on the same page if you are going to commit and have a future together.
Take a leap of faith. Once you're both on the same page and ready to commit, do it. There's nothing formal about this. Having a talk about it may be what you need, or go somewhere romantic together and use that as your "commitment dinner" or something along those lines. Committing yourself to each other does not mean you will be together forever. It means you love each other and will continue to spend time together and get to know each other.