Passed test 6 months ago and still not confident driving. In past week I've made two big errors 1. Forgot to give way to tight on a double roundabout that I go on every day! 2. Forgot to give way to oncoming traffic at a crossroads. It's like I just 'forget' that you have to do that and I just go when light is green!!! There are also situations where I don't know if I'm doing the right thing or if I'm in right lane etc. If it wasn't for other quick thinking drivers I could have crashed by now. I don't get why I just 'forget' stuff. I don't have radio on and I am trying to concentrate. I feel like I am a rubbish driver. What can I do to be a better driver and not so absentminded. Is there something wrong with my brain for making these stupid mistakes?