How to politely tell my boyfriend I don't like the way he kisses me without hurting his feelings
It may be easier than you think.
While you are kissing him, whisper, "Do it like this..." and show him, and then say, "I love it when you do it that way." Giggle and respond when he does it right. Gently pull back when he does it wrong. I don't know of any man who doesn't want to please a woman by kissing her the way she wants to be kissed. If you gently encourage and tease him, he will do almost anything to please you when he kisses you. I know I would.