Big guy, but totally a bottom?

So I’m a pretty big guy, 6’ 4” 190 lbs, outwardly most people assume I’m straight, so most guys I meet just expect me to be on top, at least most of the guys that I’ve noticed are interested.The issue here is I’m 100% a bottom. Sure, I like mixing it up every once in a while, but my heart’s just not into it (there’s a pun there, I know it). I’m just so much bigger than a lot of other guys, it kind of throws them.So does anyone have any advice on, I don’t know, “sending the right message”?