Ignore some of this bullshit above about getting on gear (which will destroy your natural testosterone) or horny goat weed, which is an aphrodisiac (biochemically, it does the same thing as viagra, making you think you have higher testosterone).
What are the other numbers given on your blood test? Particularly LH, FSH and estrogen/estradiol? Just something else to note - time of day (or even having a bad day or not enough sleep) can drastically affect your results, so a retest in different circumstances would be warranted if you're really worried.
Take a look at some of the food suggestions below. I hope you're eating plenty of these. Diet plays a large role in natural testosterone. Brassica vegetables (the ones everyone hates; e.g. broccoli, cauliflower, cabbage, brussel sprouts, turnips) have been shown in studies to reduce the amount of testosterone converted to estrogen (giving you a natural testosterone boost).
Gynecomastia Diet-14 Veggies That Double Your Testosterone level ? Understanding Gynecomastia
The top 10 testosterone boosting foods! ~ Body By BB2K
Sauerkraut (good on the side with meats, hot dogs, or in a beef sandwich for lunch) and broccoli and cabbage are easy to work in the diet.
Reduce your intake of simple sugars and carbs. No more candy or sweets, switch to brown bread. A diet high in simple sugars and carbs isn't good for your testosterone levels. Saturated fat is good to an extent for your testosterone. Buy cuts of beef (not mince, they put all sorts of shit in that) with a little bit of fat on them (these cuts tend to be cheaper anyway!), and start eating thighs and drumsticks instead of breasts sometimes.
Of course, lifting weights also increases your testosterone. You should be in the gym 3x a week. Cut back on the

, no more than 3x a week (sex is ok).
One thing I have noted from working in England occasionally (I travel to the UK and Western Europe a lot) is the lack of sunlight. Being outdoors with unfiltered sunlight hitting your skin = vitamin D production. Testosterone production is DIRECTLY linked to vitamin D (read all about it here:
https://www.google.com/search?q=vit....,cf.osb&fp=a2e370afc0354df8&biw=1366&bih=653 ). Vitamin D deficiency affects a large part of the human population who live in Northern latitudes. Buy yourself a large pack of vitamin D3 vitamins (they're EXTREMELY cheap and I believe that creatine and Vitamin D are the only supplements WORTH buying. You can get several hundred D3 vitamins from tesco for under 10 quid) and take 1000iu per day.
I
guarantee you will see a turnaround in 1 month following this advice. Message me in a month and let me know how well it worked out for you. Or ask away if you have any questions.