If you just want to fly, don't build it yourself.
Building an aircraft from an advanced kit will be almost as expensive, or even way more expensive in some cases, than a good 2nd hand 152 or so, and will require at least a year of dedicating all your free time to the project. If you spend that time in a proper job instead, you raise enough money to buy a proper aircraft.
Take a basic kit (just parts, no work done by the factory) or try a plans-built aircraft and you might be looking at up to 10 years before you're finished. If finances, marriage, kids, medical and other things don't have you abandon the project before it's finished.