Well, Feynman made a lot of discoveries, won a Nobel prize and is so famous you mentioned him and I was actually going to mention him by saying 'you are no Feynman'. It is ok if you want to push yourself and maybe you are a rare talent, who knows. Odds are low but they surely do happen and surely such people would have internet access.
It's just that I don't think it is a good idea to tell a 16 year old, or anyone for that matter, they have to meet up to Feynman standards.
No one told the child Feynman he had to study harder or be inferior to whatever child prodigy.
In fact, there is a lot of child prodigies that got famous as children, in chess, music, math, or whatever else, that burned out, lost interest and never achieved anything superhuman.
So indeed, Feyman, and quite a few others, were a lot further than you are at 16. But no one here is going to compare you to that standard. If you want to try and meet it, go ahead.
You have to wait a few years in the sense that first you need to go to college, take the basic undergrad courses, and only then you get to do he fun stuff.
As every 'old person' will tell you, they have some regrets about not enjoying their childhood more. For many people their teenage years were some of the most fun of their lives. Once they are gone, they will never come back. Once you are an adult, you can no longer act like a child. In fact, I feel emotions and experiences get more numbed out as you get older, slowly the very vivid colours you are used to may be gone and everything seems more pastel and plain, if you get what I mean.
Therefore, I'd say, don't try to be an adult at 16. The more demands you put on yourself, the more you set yourself up for failure and unhappiness. But on the other side, there can be regret that you slacked too much and let opportunities pass by that will now never come in reach again.
You have to find a balance there, but you seem already worried you aren't living up to unrealistic ambitious. You need to set yourself up in such a way that even if you fail, you won't be unhappy. But you expressed at your age of 16 that you feel you have failed already and that now it is all too late.
Well study hard, have fun, have fun with other things and don't forget social and interpersonal development. I myself actually feel that you can learn physics easier when older than social skills. And social skills can get extremely deep and sophisticated and contrary to physics it is much more elusive as to what it is.