Charlie Sheen is just happy he’s here to tell his own tale.

The star’s new memoir, “ The Book of Sheen ,” is full of shocking moments straight from his birth. “I was born dead,” he writes — strangled by the umbilical cord and revived. At 15, he lost his virginity to a Vegas hooker paid for with a credit card belonging to his dad, actor Martin Sheen.

There are enough drugs in the book to bring down an elephant, leading to a a near-fatal cocaine overdose in 1998 and seven trips to rehab. Not to mention his HIV diagnosis in 2011.

With eight years of sobriety — and, he told Page Six, celibacy — he felt real “gratitude” celebrating his 60th birthday last week. (He celebrated with a family lunch and a trip to the spa with one of his sons.)

“A lot of this should be viewed as gravy,” he sai

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