Congratulations, Sergey!

A few corrections for you, but your meaning was clear, so well done.

about myselfe myself:

this jule i have complited succesfully internship, and now i'm a doctor - pediatrician)))
yeah, i do it :-D

This July I have successfully completed my internship, and now I'm a doctor - a pediatrician! Yeah, I've made it!

(In English, we use "made it" to show we have done something successfully) :-)

About Myself

This July, I have successfully completed my internship, and now I'm a doctor - a pediatrician. 
Yeah, I did it :-D!

Congratulations!