Causes of low testosterone

This will be a bit long, buy i want to make sure i document all the posibilities:
im 23 by the way.
5'6'' height
152pounds

Here are my Current blood values from last week
E2 ESTRADIOL 31.70 [_*_] 0-56
FSH 2.69 [*__] 0.95-11.95
LH 6.69 [__*] 1.14-8.75
T4 FREE 1.08 [_*_] 0.70-1.48
TSH 2.455 [_*_] 0.35-4.94
GLUCOSE 63.40 [*__] 60-100
TOTAL TESTOS TERONE 264 [*__] 262-1593

2 years ago, august 2007 I had DENGUE feber, lost 10pounds, then i started gym and gained like 15 pounds in the next 3 months after that, alot being body fat. I started to smoke alot and drink beer and started to feel alot of low testosterone symptoms. 6 months later i had my first hormone blood test. The results were as follows:

glucose mg/dl 89.40 [ *] normal range 60-100
total testosterone ng/dl 536. [* ] normal range 262-1593
total estrogen pg/mL 80.6 [ * ] normal range 40-115
linfocitos K/uL 3.44 [ ]* normal range 0.6-3.4
white blood cells K/uL 9.24 [ *] normal range 4.8-10.8
red blood cells K/uL 4.83 [* ] normal range 4.7-6

FSH muI/mL 1.69 [* ] normal range 0.95-11.95
LH mUI/mL 5.56 [ * ] normal range 1.14-8.75
T4 FREE ng/dL 0.98 [ * ] normal range 0.70-1.48
TSH mUI/mL 4.13 [ *] normal range 0.35-4.94

I started drinking tribulus, rez-v, red wine, brocolli, stopped smoking, stopped drinking, nothing seemed to work.

Symptoms, low facial hair, concentration problems, ED, TESTICULAR SHRINKING, almost no libido.
Almost all body fat that i acummulated when the problems started were in waist, legs and abdominal, and a little on the chest. I am 5'6'' so klinefelter is ruled out.

I have gotten 2 bone fractures already. so low bone density could be another symptom

At the moment of the last bloodtest 16/11/2009, i have been taking corticosteroids (meticorten) for an inflamation (inflammation) in the maxilar bone so, i dont know if that drug changes the values.

I have been reading books and texts about testosterone, and I think my LH is good, my FSH somewhat low so maybe they arent helping the lh receptors to use my good LH. My estradiol is a bit high for the ''good'' and finally testosterone is in the bottom limit WAY to low for my age.

I am reading alot on TRT but I would like to know what other stuff could cause the Low testosterone? What could i do to restablish my endo testosterone? What else should i test before thinking about TRT?
What else should i answer to you so you can get a more wide image about whats happening?
Please help.

[metropolis]

First and foremost, make sure you're not taking any drugs that may alter your testosterone levels (e.g. finasteride for the treatment of male pattern baldness). TRT is a radical solution and results aren't always positive. I'm not a doctor but I suggest you try a natural approach first: improve your lifestyle, get some exercise and try some natural supplements (DHEA, vitamins C,D,B and E and fish oil)