remember the old song: "don't worry - by happy"
...and follow the wise buddhist rule of living in "the here and now" = don't ponder over lost opportunities [there never are!] or worry what the future might bring [you can't predict]!
Both things might sound hollow if you're down - but never the less they are true! If you you life in the moment and make the best of it [don't 'try'], be there with/for your friends [even if you have only two], and don't take notice of things you don't have...
George TH