MacDoc's 50cc option is intriguing and will surely get you on a motorcycle and save you money on insurance.
I recommend the used car option for a few years. A used car will be close to or cheaper than a motorcycle. Motorcycles are more dangerous than cars, but it is often the other car drivers that make mistakes and put motorcyclists in hospital, or worse. You, as a potential motorcycle rider, need to learn to read the road and to predict the actions of these other car drivers, in order to not be in the wrong place at the wrong time. This learning is part of experience driving/riding on the road, and nothing will substitute. Unfortunately the time for this learning experience is also quite dangerous. Mistakes will be made. If you are in a car you experience a fender bender, no worse for wear. If on a bike you'll be in a hospital. It does not matter who makes the mistake or who has rightrs of way, the rider pays the price for whomever's mistake. Until you have some road experience, it is safest to do this learning in a car.
On a bike what will you do during the winter? Do not underestimate how cold it can get on a motorcycle due to windchill. If the temp is 0C and you travel at 50kph, which is slow, you will feel like -15C. Protection from the wind is critical to not getting frostbite. Check out some
windchill calculators. I stop riding at 3C and I have a windshield and heated grips. When it gets colder few riders are out and car drivers are not expecting motorcycles to be on the road, thus increasing the risk to the rider.
There is lots of time to learn to ride in the future, so there's no rush to get on two wheels. It's more financially expensive, it is more physically risky, and you can ride less months of the year, but it is a lot more fun. Learn the rules of the road in a car and then supplement with a bike.