Any advice :/

So yesterday my SO was upset because if he doesnt kiss me first, i wont kiss him.. And he's right.. I had never been the most affectionist person ever before, so am not used to it. If i were in his shoes i'd be upset too. So before he dropped me off i kissed him first. I really want to change that part of me bc i truley love him and he desereves all my kisses. I told him i was gonna change little by little but I feel like he is still upset. Any advice? :/