Please stop comparing yourself to others. I'm the worst culprit of this though, but at the end of the day everyone is different. You are an individual, and you should be content with your own achievements - and, most importantly, live your own life to the fullest. Your dad really isn't being supportive, but unfortunately not everyone's parents can be. Enjoy your time at university and try and build your confidence - don't keep holding yourself back. At the end of the day, not everyone goes to Cambridge! I am sure you are therefore by no means 'thick' - far from it, I would go as far as to say. However, I can totally empathise with how you are feeling because I am in the same situation. I hope some of what I have said can be of use to you though.