I don't know how to end things with him?

I've been dating a guy my age (highschool) for something less than a month. We have gone out four times and he was also my fist kiss. I wasn't sure i liked him at first but after the second date i thought i did... come to find out i actually don't feel attracted to him. I feel bad because i feel like i've led him on, even though i thought i liked him when going out with him. We've also discussed about my strict parents and about me telling them about him, but as i said, i no longer feel a romantic connection to him. I keep thinking about it and i think that he aslo impacts my academic performance, which i want to maintain at a high level. I told him i need space to think about things and he seemed concerned. Any advice on how to move from here on, will be greatelly appreciated♡
I don't know how to end things with him?
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