Do you have a problem to solve, an idea of how to solve it, and is now the right time to start a company to build it? Does this problem-solving idea keep you up at night? Then you should just start the startup now to test the waters. If you are just interested in the idea of starting a startup for the sake of starting a starup, then go work for someone else's startup to see how hard it is, and you might just get some sense knocked into you.