some people do end up hating taking chemistry because they try so hard to memorise/rote-learn all there is in AS chemistry (which is not a lot, actually)
or you could begin to see that it all comes down to basic details - force, energy, interactions, sterics, electronics that govern almost everything, if not all, of AS chemistry and in fact A'level chemistry as well. i think if you enjoy physics and can do math, chemistry should not be too demanding. that does not imply that if you dont take physics, you'd be miserable in chemistry - no no. Math + chem and bio are fantastic combinations as well, just more so towards the biochemistry side - the chemical reactions in body - ie why cyanide or carbon monoxide poisons/kills you? etc.