What image of myself can I believe?

I'm in panic mode because I'm meeting my boyfriend for the first time since 8th grade (I'm a sophomore) and I'm now 168 pounds. Overweight. I've been trying to picture how I would look to him just so I'm prepared. But every mirror, camera and what not that I look at is different! The vertical mirror makes me look thin, the square mirror makes me look big. The camera makes me wider. What image is realistic? My friend who is honest told me I'm not fat but chubby and it's only mild. What's the best most realistic way to see myself?