I don't think so. As long as you know you want to date and you feel comfortable. I think 15 is the perfect age to start dating. If your parents say no then you should obey them and keep their trust, then wait a couple months later before you ask again. Just be careful and don't get serious too fast.
I think it depends on how your parents have raised you. If you were taught boundaries as to when you would be allowed to date, I think you should obey the rules. However, if they have not mentioned anything at all, I say, "Go ahead by all means." Personally, I was not allowed to date until after I finished college, so I could focus on my studies. I hope this helps!