You'd look like a cartoon. Or Bane from teh Christian Bale Batman series. Tom Hardy wore that height to look formidable because I think he's your height or less.
Go for 2-3 inches like @Leon suggests. Build your confidence too.
It's less about what you look like, and how you carry yourself. This takes time to develop, but remember she's not dating your looks like you are. She dating your stature. That's why frame is important. Develop on your other six life areas, and I bet you'll start feeling more relaxed and comfortable that your height won't be a thing you think about much.
Not meaning any offence but it's against my dignity to do something like that. I dress well, I work out, I improve my social skills but I won't do something like that. I know a very short guy, around 5'3" who has a very hot 9ish girlfriend. He's an MMA fighter and has a great body.