How can i promote my music?

[JimKash]

I am an 20 year old aspiring artist/rapper from columbus ohio which may turn heads but i think i at least have the potential to be good.The problem is i dont have alot of support neither do i have alot if any at all connections in this industry.I posted a freestyle i did on Drakes poundcake and got fairly good responses when i posted it to soundcloud.This being said i didnt promote it on facebook or any other social networking site.Most of the responses came from unknown listeners.The thing is i dont have a twitter of instagram but i do have a facebook w/ not many friends and a tumblr with about 30 followers.Im going to record my first song soon which i think is good with me only given minor effort and hopefully soon after shoot a video.Im very creative and talented but even my friends dont think i really have a shot at this being that its a 1 and million type industry.My point is would i need to make a twitter and what are other ways i can promote my music that can actually get me noticed.Ive read in these past couple years of artist getting discovered by one song or two songs by it going crazy over blogs but im sure they have more support than i do.Any advice would be appreciated expect someone telling me how impossible it is because im aware of all the probabilities.