Most Helpful Guy
Seriously, for the most part, guys don't care if their girl is shorter than them. I don't think they mind if it's all that great of a difference in height. I think for the most part, guys are just hope their girl isn't that much taller then them, as that could be a tad emasculating. But seriously though, no, most guys don't care that much, and some even prefer them to be shorter.
As for your guy. He's SIX FOOT FIVE! I mean REALLY. Don't you think that just maybe he's used to girls being shorter than him? Think logically. What kind of mutant would he have to look for to be his size? lol I mean really. Sure you're a foot difference. So what. Trust me, unless he has a serious back problem that stops him from crunching his head down or crouching down a little, then I don't think kissing will be a problem. As for sex, at most it will be an adjustment. AT... THE... MOST.
Trust me. You'll be fine. Just give it a shot, and maybe he'll like you no matter what. Maybe he'll even like your height. Who knows. Either way. Don't worry about it.