1- Your self worth is determined by others, you are not an island, you are a social creature.
No, if society deems you worthless then you are indeed worthless, if you are not valued by others then you have no worth.
"Society" is always changing and constantly undervaluing and overvaluing people, for stupid reasons. Prejudice, mostly. And people who are valued highly by society most of the time just simply got very lucky. A lot of the "popular" people just had an opportunity and took it, they weren't just magically loved by everyone and no, their life isn't rainbows just because of that.
All the time in history, there will be genuinely amazing people who got excluded for literally no reason other than plain stupidity: racism, bigotry, you name it. This is what "judging by appearance" means.
Your true worth as a person will never depend on what society thinks of you on the surface.
2- Your happiness comes from other people, you are not an island.
No, you won't find happiness within, you are a social creature, if you can't form healthy relationships with other people then you will always be miserable and feel like something is missing.
This is an extremely toxic trait, and I say this because I relate a lot to it, so trust me.
This is cope, nothing more. You will not find happiness in other people, if you're a wreck that's a problem that goes way beyond that, clinging onto other people is nothing but an attempt to escape the harsh reality inside of you.
In my case it's childhood trauma, to each its own I guess, but you will not fill in your void like that.
Being a "social creature" doesn't mean that we physically need to be with anybody else to live, or we would rather die, it means that sharing our life with people that we really feel close to makes it better, and we can enjoy and cherish those times.
Finally, don't ever get friends or partners because you feel like you need to be with someone, that will just end up hurting you more.