Shareef O'Neal is giving an inside look of how far he's come since his serious heart surgery a year ago ... sharing behind-the-scenes videos on the anniversary of his procedure.
As we previously reported ... UCLA doctors found an irregularity with the 19-year-old's heart and he was required to go under the knife to fix the issue.
At the time, Shareef credited the docs with saving his life.
O'Neal is reflecting on his journey one year later ... sharing pics of his parents Shaq and Shaunie helping him walk for the first time post-surgery, and breaking down how he felt in that moment.