Never had any major issues running on lanes, which I do a lot. Only ever negative comment I've had from a motorist was on a narrow lane when I was told to "stop listening to music and you might hear a car coming". The pillock didn't know I was actually listening to a podcast, quietly and had heard him coming perfectly well, but was running on a bit further to where there was a passing place. Apparently he thought I should have just thrown myself into the nettles immediately to avoid him having to slow down.
I would definitely advise as others have, that you try to avoid the common mistake of nailing every run as hard as you can. Mix it up. Longer slower runs, intervals, hills, shorter fast runs. For the faster shorter run, I'd recommend Parkrun, if you have a local one.
For weight loss, I found that diet was way, way more important for that, than running. I lost a bit initially but I ran for years, eating crap and stayed pretty much the same - a bit lardy. It wasn't until I changed my diet (in order to improve my running), that I saw any significant weight loss.