You need this lab work, come back and post with the lab ranges:
TT
FT
E2
LH/FSH
prolactin
TSH
At your age, you need to do some diagnostics to try to find the cause, hopefully something that can be fixed.
Please read the stickies found here: About the T Replacement Category - #2 by KSman
- advice for new guys
- things that damage your hormones