A few points in reply to your comments...
It's not the bike. I used a hybrid for commuting 2x10 miles and long distance rides (100 miles +) for several years and it never held me back. There are things you can do to optimise the hybrid.
You have a suspension fork which is not ideal, but also not a disaster. If there is any adjustment to stiffen it up at all then do it.
Tyres can be changed, I ran a relatively smooth tread in 35mm width which suited me. You could even go a little smaller to 32mm but any gains are minimal while it does result in a small sacrifice in comfort for each reduction in size.
Rear cassette on your bike is 11-34? This is a ridiculously wide spread for a road going bike. You could easily run a more suitable 11-26 which would be far more practical for road commuting and you still have the small 28T chainring for emergencies if you hit anything shockingly steep.
Your 'ave' speed of 14 mph is quite fast so I guess you actually mean 'typical' speed, as in the speed you would normally cruise along at. Anyway, regardless of what you meant it is not your concern. As has already been said, the onus is on the drivers to wait and pass you when safe, not for you to speed up to match their velocity!