Get a Saiga rifle, they can be had in 308 Winchester and 7.62x39. Very budget friendly; around 350-400$. ( Since you're 19, I assume you have very little cash)
Reliable as all hell, and you can modify it later to have a pistol-grip stock. Comes with 10 round mag, but you can buy higher capacity mags later.
Same operation as an AK, just minus the flash hider and/or muzzle brake and it's uglier than sin, similar to an AKin that manner too I suppose.
“Firearms are second only to the Constitution in importance; they are the peoples’ liberty’s teeth.” – George Washington
If you are not free to choose wrongly and irresponsibly, you are not free at all. – Jacob Hornberger (1995)
“Among the many misdeeds of British rule in India, history will look upon the act depriving a whole nation of arms as the blackest.” – Mahatma Mohandas K. Gandhi