Don't be so hard on yourself. GILD wasn't doing too much for a number of years, then it saw the reflection point last year when sofobusvil was bought. There is still time to get in as this stock should head for the 3 digits within six months, if not sooner.
GILD is now my second largest holding - I sold my GOOG (bought at $300) around May to pick up a large stake at around $51. Will hold the stock for at least 3 to 5 years, or until the growth slows down.