That i also understand but i did read that in general economics is useless ?
How is economics useless? There are so many type of degrees, all of which you can just go onto Wikipedia and learn the technical content on your own.
University train students to think critically, not so much of the content really... IMHO econs is one of the more interesting topic, you learn to draw inferences to things that's happening around you, and understand why things are happening.