You have indeed an advanced hair loss pattern at very young age.
If you have very low expectations you should first get your hair stabilized with a combination of treatments and medication. There will be no high density, and probably only a portion of the balding area will be possible to treat.
Hair strengthening will take about 12 months before you will have a re-evaluation for hair transplantation.
Only thereafter would a limited hair transplantation be possible.
However, SMP with a shaven look style hair cut would be ideal in your case.
You can have a result in a fairly limited amount of time, less costs and you would be able to deal with the entire balding area at once, simulating a high density.