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weight: 183

Bench: 187

Squat: Never tried my 1RM (when I workout I dont usually have a spotter)

DL: 280

This.

Stuff I hate:
Body fat seems to accumulate purely on my midsection
My calves are so stubborn I have all but given up
Weak (lax) shoulder joints

Stuff I like:
Tall
Quads are insanely strong...

6'4 (I am still 15)

Be careful not to overtrain/overload the shoulder... otherwise your shoulder will **** up... at least mine did.

I cant really give much advice because I seriously screwed up my joints shoulder...

I have the same issue, lax shoulders...

Basically you need to let it heal... This may mean no shoulder exercises (military press is the worst), however trust me it is best to let it recover now...

At your weight you cannot gain muscle unless you eat more calories then you burn

Same three Things... More meat... More Lifting.... No sugar...

We're the same age and I know its hard to give up soft drink and all that ****, so just start by having diet soft drinks, and from...

If you are sprinting every-other day hitting one HEAVY leg day is more than enough

Are you talking about hip bones or fat. Your bone width is genetic (I am cursed with big hips as well), but if they are just plump then yeh, you can work them off...

It's hard to tell without a picture, but in weighing 125 I'm guessing that your "nice flat stomach and pecs" simply means you have low body fat.

Also tell us about your diet!

Anyway... Eat more...

Theres a difference between puberty and simply growing. You stop growing at age 25, boys usually hit puberty around 13-16

Look I really doubt it bro... I lifted casually since I was 13 and sure, it didn't see any gains, but I still shot up in height (went from 5'11 to 6'4 in 1 year) when the time came...

Your body stops producing HGH (Growth Hormones) at the age of 25, so you will probably grow at least marginally taller... then again if you are 20 and look older then your age its likely you've...