Listen, man. I was in about the same position as you at your age.
I have had low-normal T levels since puberty, despite having a normal sex drive and no problems gaining mass. I still had problems with chronic fatigue, anxiety and depression.
I'm almost 20 now, and have been on TRT for 3 months and HCG for about a month. I've researched the topic thoroughly and was not given an answer on what kind of long-term effect getting your T levels in the top of the (normal) range with weekly T injections would do to a 19 year old, but I took that risk anyway and only time will tell if I will regret it or not.
After about a year and a half of going through doctors, I finally got an OK for TRT and am now on 100mg enanthate weekly. Sometimes I'll bump it up to 150 or 200 every once in a while since I get automatic free monthly refills. So far, I've made amazing progress in the gym. Depression and anxiety are almost completetly gone and I could *not* be happier.
As far as epistane goes, I "pulse cycled" it for a few weeks about a month ago with no adverse effects. That's when I made my biggest gains. I took 40mg on workout days (so 3x a week).
How will all this affect me, 5, 10, 20 years from now? Hell, I don't know. I figured my life was already halfway down the shitter before starting treatement, and while other kids my age are fucking up their own bodies smoking cigarettes and getting wasted all the time, I doubt this can be worse.
Sorry for derailing the thread with my story. I still won't do a "full" cycle until I'm about 25. Hell, I could do 500mg weekly, but I have the common sense to stay within range.
FWIW, I recently tried Novedex XT, figuring my estrogen would be somewhat elevated from randomly bumping the T injection dosage and the added HCG (my most recent bloodwork is only from after 2 months of doing T injections Sub-Q without HCG, and the endo said my T was high-normal and estrogen was well within range.
Anyway, the results I got from the Novedex were pretty dissapointing. The obvious reason is I started out way too strong at the full 4 caps. I only did 4 days and it made my joints ache and my strength and libido went down. I'll take a while off and maybe restart at 1 cap a day.
You know, discussing this kind of blatant misusage of these drugs as a 19 year old kind of feels like discussing doing heroin or crystal meth on the bluelight forums.
Anyway, my closing statement is that, IMO, as long as you don't do any hardcore AAS cycles you should be "OK", and by "OK" you won't experience any immediate short-term side effects worth noticing. You can try pulse-cycling the Havoc for a few weeks, but I definitely would not take it daily.
My .02$