What do I dooooooooooo?

I was at braums with 2 of my friends and he and all of his friends (alot) were at a table and they yelled over at me, "Do you want to go out with him?!" Really loudly and then came over and were talking about how awesome he is and stuff and I felt really pressured to and then he shyly asked by himself, and I hardly know him so I was like, "I don't know.." And they were like, "SAY YES OR NO." And the next day they saw me and they were like asking me "Yes or no" again, and I said yes, even though I don't want a boyfriend right now. And it just didn't feel right to me.. I don't like his friends butting in and all that.. So later I changed my mind and I said, "Well there's no point, I'll be in highschool pretty soon and I will never see him.." And they were were like "SOOO!?" And they won't stop bothering me.. Idk it doesnt seem genuine. How to I get them to stop?