Yes, as a teenager, you are obligated to obey your parents, as well as not to lie to them. If you haven’t already, try to have a calm conversation with them, where you ask them to explain clearly why they don’t like him. I find that the best way to do this calmly is to let them explain, and not to argue the points or try to convince them my point of view. You can save that for another conversation, but just listen to them and use this to see where they’re coming from. Pray about it and consider their viewpoint - often parents have a perspective that allows them to see the situation more clearly than you might. That’s not just because you’re young either. Often, people (of any age) in the middle of a situation have a harder time seeing things clearly than an outsider looking in, you know?
But suppose they are wrong about your boyfriend. You are still obligated to obey them. This is a big sacrifice to make, but one that will help shape your character and will be ultimately good for you. Ask your parents if they will allow you to socialize with him in situations where they are present. If you really do have a good friendship with him, you will be able to maintain the friendship - that may be more valuable than having a boyfriend. Maybe he’ll even win them over.
I know from experience, that it is very hard to let go of a romantic relationship even when you’re young. Even if you know that he is not going to be your husband someday - it’s still hard. And please try to honestly look at the situation and remember that most people don’t marry their high school sweethearts, so there’s a good chance this is the case with him. I’m talking about marriage because that really is the reason why we date - to find our spouses.
Also keep in mind that if he cares about you as much as you care about him, he needs to respect the fact that you have to obey your parents. You can maintain whatever level of friendship your parents allow, and when you are older, if you are still interested in each other romantically, you can date as adults.
Also, aside from your actual husband (assuming you do get married someday) and your siblings, your relationship with parents is likely to be your longest lasting and possibly most important of your life. So don’t neglect that one. This is an opportunity to either hurt your relationship with them, or to make it stronger and more mature. God bless you.
TKC