This is all about your metabolism.
If T is low and/or T:E2 is adverse, you will gain fat.
If thyroid function is low, you will gain fat.
With the above, fat loss is very difficult. Starvation diets are dangerous.
See these links found here: About the T Replacement Category - #2 by KSman
advice for new guys
protocol for injectons
thyroid basics explained - check oral body temperatures as suggested
Get some lab work:
TT
FT
E2
LH/FSH
CBC
fasting glucose
A1C
fasting cholesterol
PSA
DRE exam by doctor
AM cortisol
TSH - if body temps are low, also do these
fT3
fT4 - please not T3, T4