“Love” isn’t some forever thing you think it is. You will not always be “in love” with your partner, nor will they always be in love with you. Relationships are WORK. The person you are “in love” with isn’t the same person you’ll be married to in a year. People change, and because of that, sometimes they become incompatible. That doesn’t make your parents wrong. Your view on relationships is unrealistic and naive. The fairy tale image you have of love doesn’t exist. What they mean by you being “too young” is that you have no idea what kind of people you will become. Your brain isn’t even developed yet.