Having sex

So I’m a junior in high school and this is my third time having sex now. This guy coming over and we flirted a ton and I’m kind just like why not ? So anyways he said he kinky and that I should know girls have asked to stop because of it. I’m really just worried now ! And also because I suck at giving blow jobs and I don’t really know how have sex I guess ...idk how explain I feel really foolish now .