I'm at the other end of the spectrum, although I did have a lot of self employment where I paid both sides.
Before I post any numbers, I want to say, SS is more than just a Pension at retirement. It is a disability policy, that paid off very well for me. My dad had a severe heart attack when he was 43 and I was 18. SS disability helped me get where I am because I didn't have to support my parents. It also paid some for my sister until she got out of college.
So, it is a pension, a disability policy and a pension for the surviving spouse and kids at death.
Over 49 years of work I paid $116,535 in SS taxes and my employer paid $14,898 for a total of $131,433. I'm waiting until 70 to start collecting and I expect $40k a year in SS, (assumes a COLA of 4% the next two years).
That means in 3 yrs 5 months I will get back all I paid in. Plus I was covered for disability and my family had some security if I had died.