No-one is too fat to date, but I'd honestly be concerned about your health rather than anything else.
Funnily enough, I weigh exactly the same as you (last time I checked). I've started to do more exercise and eat more healthily and it is going some good.
I have no problem interacting with the opposite sex (or same sex, whatever floats your boat). Confidence is not something that can be determined by your exterior features, it's about how you feel about yourself. The most gorgeous girl ever could still look (and do sometimes look) in the mirror and don't find themselves attractive.
If you'd happen to be looking for exercise tips, I definitely recommend swimming. Diet tips, I wouldn't follow any extreme ones because weight-loss for them is normally quick but short-term, and can often have serious health risks (however, arguably the health risks from being overweight outweigh the health risks of extreme dieting). Eating less of the bad stuff and more of the good stuff is a pretty solid rule to live by.
So, no. You're not too fat to date, but it seems like this attitude/assumption is maybe the reason why you aren't dating currently.