wat stage of puberty am I in?

I am a 13 year old boy, neding help wih something. i want t know what stage of puberty am i inor soon to be going into, I dont have any knolage of the stages or anything. I am 5'10 1/2 (I Belive) and i have started to see my scrotum starting to droop more and more over the past 6 months. and my penis is 1 inch non-erect and like 4 1/2 inches erect. I have some black armpit hair, (Not alot but the theres a gp between the top and the bottom of the pit). I have a signifigant amount of pubesthat extend to my thighes.

Thanks in advance for any help.

Austin