Your situation is not that uncommon. Some might even view it as a positive compared to premature ejaculation (PE). In my young life (I'm only 45) I've gone from being overly sensitive and having PE, to losing almost all feeling in my penis and having anorgasmia.

My main advice to you is to see a doctor before waiting too long. There are many reasons for issues like this: nerve damage, diabetes, overweight, arousal levels, low testosterone, etc. Some of them are preventable, reversible and/or treatable...meaning a visit to the doctor could set you right in bed.