Mid-Life Blues

I just turned 45 years old and I’ve been feeling very somber about life. My loved ones are aging and I don’t have any children of my own. I feel like everything I knew and loved is fading around me. I’m conscious that I’m in the latter half of my life now and I don’t feel excited about losing everyone I know and love and I don’t feel excited knowing that I don’t really have anyone who will take care of me in my old age or miss me when I’m gone. On top of that, I get super bored with the tedium of my job and just feel like quitting most days. I want to feel better, but I don’t know how.