If you consider citizenship to be "no benefit" (you can still vote, collect Social Security, etc. overseas), you could always renounce your citizenship.
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.
