Bike for beginners

Hello everyone! I will be in July 18 and would like to buy a machine, if possible before I turn 18, so that I can drive for my birthday. So I wanted to ask myself slowly. Have so far car driver’s license (the 17s version), but also drive constantly with my scooter. To my further two-wheel experience I have to say that we drive every year 5 weeks to Greece. There we are always in an area of 10-15 kilometers which is somewhat secluded, where I’ve always been riding a Yamaha (I don’t know about the model anymore, but I had an enduro), which had around 40 hp. So I’ve already had general experiences, which also made me notice that I don’t really like the riding feeling of an Enduro. I was sitting on a Yamaha R1 and I used to ride a few hundred meters with her, and the feeling was much better. I would honestly like to get a sports bike for the 18th time. (R6/GSX-R 600 or something like that). Actually, I’m a reasonable person who would get a bike to “ride off” the trial period until I’m 19, but then the money would not be enough for an athlete anymore, and since I can think of a real machine that would be really painful. Since there are probably many experienced professionals who could advise me I just thought to post here. I have saved another 1000€ on autoscout24.de. I have already seen many machines in the price range, but I am not sure if they are really so perfect. lg, Alex