Hello need some answers here

Okay uh so i dont have any experience in dating at all but then one day i was confessed to. Honestly i feel bad turning them down so I accepted and we became official (ik it sounds stupid) but honestly we've known each other for less than 2 days and it was going very fast and im scared bcuz idk what to do. Man's be love-bombing me when we just met for less than 2 days. So I decided to call it off and tell him that I think it's better if we stay as friends. He said okay but he's also waiting for me. Atp I really don't know what to do since he's younger than me so he kinda acts like baby sometimes and I lowkey dislike it BUT I FEEL LIKE I JUST DROPPED INTO DEEP HOLE AND I FEEL REGRETFUL. He's nice and all but at the same time it felt wrong. Should I actually wait for him because I think that he'll change with time. If there's someone who actually read this, ily so much.