My testosterone is very high for my age. A cosmetic surgeon doctor I have known since high school once still suggested that if I wanted to have an even higher sex drive (yikes, my gfs are already run ragged), I could get shots.
I know people who had low T like you in their teens and they just take shots for this, over their whole lives. No big deal.
So...the decision is yours if you want T shots. Some doctors might suggest that you do, and others will say no need.
In the meantime you could try a slew of herbal remedies like Tribulis, 20-Hydroxyecdysone, DHEA, Methoxyisoflavone and Ipriflavone to try and elevate T levels. I take all those and many more daily. Come to think of it, maybe that is why my T levels are sky high!