the OP does not provide enough info for armchair psychoanalysis. simply getting older, by itself, can be depressing. seasons makes people depressed.
i would suggest only to vet your doctor carefully. its my opinion that a lot of the therapy business is a racket that solves no problems for their patients, to ensure endless stream of cash from insurers.
my experience with doctors is they tend to have 95% worthless observations you already know. once in a while, you might get a gem that clarifies your thinking. sorta like combing through 30 crappy GFY threads before finding an insiteful business thread.
whatever the answer is, will likely require work, & some effort to re-connect with happy people. Study the law of attraction, cause self isolating will not help.
GL.
