Is there no freedom in society anymore?

its like HL2, you think youre in a massive world but the plot is too linear

youre born, go to school, work, and die

wtf?

There is some freedom, it just takes some effort, and a willingness to do thing outside what's "normal" or "essential to modern life". Try looking into things like "hoppy electronics", "urban hacking", and "art". Although, you should consider using Garry's Mod if you really want play around.