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!
I read on a website which matches the numbers of a health care provider I am seeing. He's not an MD (but knows more about horomones that my family doc). In fact, he knows alot about health in general including the 10 most important blood tests to have done and their target range. He gave me a 200 question form (fill in the bubbles) which covers symptoms for each system of a persons body and works with my MD to get me on prescriptions or OTC products as necessary for optimal health. Anyway this website said for a person to get the true benefits of testosterone which is not just a sex horomone, but plays a role in all different parts of our bodies, that your free testosterone should be in the upper one third of normal range. Benefits include better sexual function of course but also help with mood, sleep, and many other things. I'd have to do a Google to write down the full list of benefits but the point is and what I have found out alot later than I wish I had is that being within the normal range isn't always the optimal range. This person I am working with right now is going to get me on the right track and that started with a point in the right direction as far as doing my own research.
Your T level does look low to me but measuring free T is more important. LH also at the lower end of normal. If you decide to treat it, look carefully at HCG rather than T shots or cream/gel. If you do not take HCG your testicles will shut down, shrink, and you will become more or less sterile. You can also take HCG in conjunction with T replacement. The HCG will keep the balls working. It is almost identical the LH. You probably should look for an anti-aging specialist if you decide to treat it. They know how to do it right. Most doctors (including endos) do not.
Human growth hormone and DHEA are not NOT NOT safe. They can cause you serious health issues over time (such as increasing cancer risk.)
Tribulus is okay.
You probably don't need to increase your testosterone as much as decreasing your stress ( moderate- not extreme- exercise, proper sleep, healthy foods, stop caffeine and alcohol, meditate). Fewer stress hormones should lead to stronger sex drive.