I am 16 years old and my vagina is super itchy and burns mainly the inside. i am sexually active my partners penis is also itchy what could this be?

An STD or yeast: i would suggest you both go to your physician for a check to see what it actually is.

Possible infection: The itching in you and your partner's genital area may signal a yeast infection. Best to see a health care provider for examination and appropriate tests. Using condoms will help protect against sexually transmitted infections.