penis size...women orgasm

hello everyone.i am posting this one so i could ask 2 things.

1)my penis is "hard" 16cm long and i am 17 years old...is that small average or what?

2)well..i want to try and lick mt girlfriend pussy...she asked me to...but i dont have an idea how to do it and i am afraid that i want satisfie her and she will fake it or something like that...and that's becouse 2 ex boyfriends have done it to her more than once and if i wont be good she will understand it and will make bad thoughts about me :(

thank you for your time!

1) your penis size is good for your age;

2) watch some videos online, anyway, it's not a big art, just gently lick her pussy and ask her what she likes best, because warious girls likes warious things - one might like agresive sucking while other - gentle licking; this way you can show that you know more than she ;)

1) Your dick size is completely normal. I'm almost exactly the same. At your age it may even grow a little more.

2) The key is communication. Ask her what feels good and what makes her cum. Have her demonstrate just what part(s) she wants stimulated. And you should tell her what gets you off--how she should use her mouth and hands on your dick.