relationship and no spark

so I been dating this guy for 2 months now but as much as Id love to go into a serious relationship with him and I cant seem to feel anything when we kiss or even mess around. I keep thinking its normal amd eventual develop those feelings but its been 2 months shohldnt I be feeling that spark yet?

Not sure what to do, If to tell him and call it off or keep waiting (don't seem fair to him).