A good general piece of advice is not to bring self-esteem issues into this game, or the roller coaster ride will destroy you.
Unless you only want to play it to achieve excellence, chess brings many side benefits to players of all ages. If you only worry about performance, you might just be adding another stressing factor to your life and not doing yourself any favors.
To me, the question in the thread title is analogous to "is it worth working out if I am overweight?"
The analogy is particularly relevant in the context of aging people trying to stay sharp and ward off degenerative diseases such as alzheimer's. However, I feel it is also very relevant in the context of a younger person trying to work themselves out of intellectual laziness. Chess encourages you to think critically.
It's also very fun.
And if you are really worried that you might only fail and embarass yourself (a legitimate and common concern), you can add one more to the pile of "I am literally a dumb ass but after putting in some work I can play well!" stories.
i could,nt,t play till i was 30+. As for stupid?