I'm going to endorse the concept of 365 Thank Yous by John Kralik more than the book itself. It's a quick read and has the potential to change your life as well as those around you. All you have to do is pull out a writing instrument (pens, remember those items?) and something to write on (as in a note card) and write a thank you note. This does not need to be the long drawn out anguish of writing a thank you note to grandma after she sent you an awful sweater that was too small. But just take a moment to write a three line note to thank someone for what they did. Use a small note card so you won't feel like you have to write a novel and don't get intimidated. Quickly pop it in the mail or hand deliver it if that's an option. And yes, it might involve a stamp and the post office.
The author was in a terrible place at his life, everything was on a downward spiral. The idea popped in his head to start thanking the people in his life - for gifts tangible, monetary and divine. Both the act of writing the notes and the difference they made in his life as well as the recipients is phenomenal. Will the same thing happen to you? Probably not. But does your favorite barista start making your coffee drink just the way you like it as soon as they see you in line? Did a colleague go above and beyond in helping someone out and you witnessed it? Does your favorite librarian always suggest great books for you to read? Write them a note and make their day and remind yourself of all the gifts you have in your life, large and small.