bad kissers

my ex boyfriend was a really great kisser and I loved kissing him. i’ve kissed three guys since then and maybe i’m crazy but they all don’t know how to kiss. they all shove their tongues in my mouth. one guy was so bad he gave me a hickey on my top lip (?!?!?!). the guy that i’m talking to rn, the third guy I kissed since my last boyfriend, is also not good and I don’t enjoy kissing him as much as i’d like. how do I make him better? I don’t want to hurt his feelings