This is not a cure all, but it is a true statement. The feeling you have is the product of not having someone (or something) to care for. You have been caring for yourself all these years and you need something (other than your Apple) to be responsible for. Something that needs you and will fill a void. Two ways to fix this:

1. get married, have kids. Those little crumb snatchers will drive you crazy, but you will love the ride.
2. Get a DOG. Boxers, bull-dogs, or pugs are great.

The only other way to fix it is to get a full time prostitute. She will need you until the $$$$ runs out...HA HA! Just kidding mi amigo!
God Bless