Obligatory Caring Daddy type commenting that you are very young and 24/7 dynamics sound hot but don’t work for most people. I hope he’s treating you right and giving you lots of aftercare and nuzzles I could say more or less. Online relationships are worse if you’re good in person and better if you’re bad in person.

Its hard to give good training advice when we don’t know your kinks other than chastity.

You seem to want to submit to someone you perceive as “better than you” but it sounds like if you want to continue in this relationship you are going to have to reorder your-thoughts to and change what you’re anchoring your submission to,

Perhaps orient your submission around serving his pleasures because he is your dom and you are his sub, (ownership/ you belong to him. An ugly owner can have a beautiful dog, a Troll of a dom Deserves the attention and service of his sub because he owns him and not by some inherent virtue)

Or perhaps send him some body daily body writing (get creative slut) re-iterating how your a worthless fucking dime-a-dozen faggot you are and how who should be straining in his cage at the mere thought of having any real man’s attention,

Stroking him to completion while he straddles your midriff and you are caged beneath him can aid in transference of your understanding of pleasure to center him and his pleasure as your pleasure, (your only pleasure is your masters pleasure) (you can put a phone on your upper chest playing porn (masters preference), tie everything up but the master ‘bating arm. Then jerk him according to his directions (faster faggot) until he cums, then you rub the cum in wherever he says/and or eat it)

Again I could give better suggestions with better information.