Greetings.

I'd like to get a few answers from experts, about the way of penis works, and possible techniques of training it.

I'm 24 years old, and I have 16 santimeters of penis(erected state ofcourse..). It is enough to satisfy my girlfriend, but I'd like to make it be bigger, and that's where I require some answers from experts...
My family (father, and my 3 brothers) proove that I should have something like 20 or more, as they have that...

Little of history:
I was quite sick kid... Lived in hospitals till 14, was under hormone therapy (on russian, the medicine I was fed with, is called "Prednizolon" (exact transcription of it's name)). That gived me a LOT of exsessive weight, great problems with my stomach and GREAT delays in sexual and physical development... I fought (and still fighting) with these consequenses with brutal force.. Killing myself in football, gym, and running (at least few kilometers per day) gave me allmost nise physical conditions, but my penis - is something I just can't train like that...
Thru killing myself like that, I've somehow gained height (now I'm 189 santimeters long), and loosed some weight (90-100 kilogramms).. If to compare with what I've had - great results...

So, the most important question:
Is there a way to make my penis grow from a side of beating my problems with my body development (normal growth)? Some medicines? Hormone therapy? (Fight fire with fire?..)
If so, then how? I presume that (if YES, ofcourse) further advises may require some tests to be made... Can you name them then?.. Or at least a doctor (he's exact profession) that can advice someting about that?

PS I've said it not verry nice and undestandable, but It's the best what I can do with my pooor english, sorry

More history (to second question ):
For last 4-6 months I am trying to increase my sizes. So far I've tried massage, and now I'm using vacuum device, a pump or something...(sorry dont know It's name on english, but I guess you know what I mean).
So far my results:

4 months of massage (done it 1-2 times per week, without any strict periods... What is not correct...), gave 1 santimeter in erected state... Nice results I guess...

2 weeks of Pumping (I do it allmost every evening, normally 2 days excercizing, 1 day rest. Sometimes training starts from sex with my girlfriend, then about 30 minutes of rest, and then I pump myself, hold 30 secs - 2 minutes, then 1 minute rest. Timing and quantity of attempts depends on my condition. Usualy I do it till it really hurts...) gave me another 1 santimeter in erected state. It hurts lot more then massage, but it is a lot more effective (so far...).

Finally, second question:
Is it safe to do it like that? Till it hurts?
Basically I understand, that main idear of both methods is to damage cells in corpus cavenosum, by drammaticaly increasing quantity of blood in them, and then allow them to restore and evolve to these new conditions. So from here - pain is normal, as It is a part of damaging cells... Am I right so far?...
PS Btw how much time does it takes for these cells to restore?
I am decreasing quantity of trainings allready, as I think that 24 hours may not be enough...


Final, third question:
I understood a lot about the way human penis erects in last month... And now I am really confused...
First I thought that PC muscle is in charge of erection... I even has achieved erection thru entracting it (no mental part was used). And I have achieved disengaging erection thru forcing every muscle in that area to relax... Works... But how? Erection starts with other muscles, as I found out... I do not understand...These all are coincidences?
If so, is there a way to force proper muscles to entract without any mental part involved?(Drugs are not an option, as It is not just an erection that I'm trying to achieve, but forsing erection to appear even if I do not want to do anything... Controling erection by other words...).
PS By mental part I mean some thoughts or actions, that usually make man erect (thoughts about females, physical stimulation of penis)...

So, that's it... Waiting for your soonest reply, gentelmens...
PPS Once again sorry for my bad english...