Please, give me a hug so you can feel better about your loneliness (ops, no hug boxing allowed).

Even though all the good things in my life that are happening I feel extremely lonely

Being single is not all "sunshine and rainbows, this is a very nasty and mean place". Most people dislike being with their only thoughts and feelings (Gosh, they prefer to receive shocks!)[http://www.sciencemag.org/news/2014/07/people-would-rather-be-electrically-shocked-left-alone-their-thoughts]. Learn to appreciate and contemplate such state, maybe you are not familiar with being tranquil and peaceful. Your zone of discomfort is the conflict (FOO issues + learned helplessness).

your secret to not staying lonely when there's no one around to talk to?

This is the secret: run from your feeling of loneliness! Keep yourself working overtime, binge eating, promiscuity, self-harming, etc.

Seriously, adopt a dog and just do what makes time go by without you realizing. Preferentially, something that use your mind and body together. This crap "just make you feel happy* about" is shallow and people who say that are just washing their hands by saying something devoid of meaning (the same goes to "follow your dreams/passions" {it is not because you love something that this thing will make you at peace with your inner anguish[which anyone honest with himself acknowledge, accept, and accommodate it.]})

*prefer to be content as this is a more stable state (closer to plenitude)