If you're registered to vote in the US, you have representatives to vote for.

https://travel.state.gov/content/passports/en/abroad/legal-m...

If you honestly see no benefit of your US citizenship, or the costs outweigh the benefits, it sounds like you should change your citizenship status, perhaps to the country you're a resident in, or maybe move back to the US.

Yes Social Security is a "benefit", you more than likely will get back everything you paid in plus interest plus continue drawing a Social Security check beyond that. Last time I crunched the numbers a retiree would on average get back everything they paid in plus interest in just under 9 years. And that is a generous estimate since I averaged payments into the system over a typical working life instead of weighing them towards later in life (people tend to make more as they gain experience and their career advances).

Social Security is not a savings plan no matter how much you would like to think it is.