You can do anything. The only one stopping you from doing what you want is yourself; others can try to stop you, but they can’t. After you do something, others can certainly shun, hurt, imprison, or murder you, but they can’t stop you. When you’re doing something, others can only help or impede your advance.
The most common way people impede you is through persuasion; they tell you not to do something because it’s stupid, unrealistic, illegal, and so on. They probably don’t do this because they’re jealous of you, or because they can’t do it themselves; they do it because they, with their life experiences and current circumstance, wouldn’t do it. You should consider their opinions and apply them to your life and circumstance, but keep in mind, they’re not you. As the band Crass wrote on banners at their shows: There is no authority but yourself.
This world is filled with many people doing many things, and all of them are valid occupations. Everything in your home was made by someone, from your home itself to the bathroom toiletries — someone designed the sink, someone installed the windows.
As for illegality, governments are established by people for their own security, with that security delegated to those they trust to insure their happiness, the trusted being those believed to have the best intentions of the people in mind. Government is by that nature majority rule, where minority beliefs are unwelcome.
Democratic governments sometimes attempt to appeal to minorities through constitutional protections. The problem with that, though, is people can only rely upon themselves. You can trust others to rule you fairly, and you can trust others to provide you with honest services, but as with all things in life, if you want something done right, you need to do it yourself — you’re the only one who knows what you need, and you’re the only one who can satisfy your own expectations. Democratic governments are like department stores in that their goods and services are designed for the majority.
Democratic governments must also self-propagate to maintain their rule, which is done by pandering to their lowest common denominator. If the majority is pandered to and happy, the government survives to reinforce itself though new control systems that, in turn, steward subsequent generations towards the happily ruled majority. If constituent unhappiness rises too high, a government adapts or dies — unhappy people are uncontrollable.