Worries for the First Car Purchase

Dear Forum, On tomorrow I will perhaps look at my first car. It is to become a used mini. At least as a car rental I have driven Mini often and always been enthusiastic about the driving feeling. Since I have little idea of cars, however, the fear is to make a big mistake. Therefore I wanted to check here for opinions. The desired Mini Cooper is the model F55, so a five doorr. He already close to 100.00lm on the clock in three years!!. First registration was 01.2016. 13k € should cost me the whole. Is that reasonable or too expensive? Are 100000 km just too much to have fun with the car for a long time? The car will certainly not eat as much as from its previous owner. A private person. In the circle of friends and acquaintances keeps the opinion that I will be with the car constantly in the workshop and that the insurance costs me much because of the model. I know about the problems the Minis in the past but have the hope that these are passé with this newer model. We see you, I have quite considerable worries and, hope you can help me get rid of some at short notice. Thank you and best regards.