The Big Bang Theory is ending after 12 seasons on the air, and Mayim Bialik is finding it difficult to process the news.

In a new blog post, the actress said she was "very sad" to see the CBS comedy come to a close.

“Am I happy? Of course not,” Bialik wrote on GrokNation.com.

“This has been my job since Melissa Rauch and I joined the cast as regulars in Season 4. I love my job."

"I love my castmates, and I feel such appreciation for our incredible crew, our brave writers, our entire staff, and our amazing fans. So many people are a part of our Big Bang family."

“This is hard,” she continued.

“I love coming to work and pretending to be Amy. She’s a riot. She’s me, and I am her. And soon she will not be mine to create… [M]y paying job — the one you know me for — is ending and yes: It’s very sad."

"I fear it’s going to be very hard to not cry every day for the next 23 episodes! But, as a cast, we love bringing joy to our viewers and we will continue to do that to the best of our collective ability.”

“Being an actor is profoundly humbling, incredibly gratifying, and terribly complex. Being an employed actor on what is the No. 1 comedy in America is unbelievable,” she said of the fans.

“And the fact that so many people consider us a part of their lives and families is powerful. I don’t take any of it for granted… I want to thank our fans for loving us hard enough to keep this train going for 12 years.”

The final season announcement was made Wednesday, around the same time The Big Bang Theory Season 12 entered production.

In a joint statement, Warner Bros. Television, CBS and Chuck Lorre Productions said, “We are forever grateful to our fans for their support of The Big Bang Theory during the past twelve seasons."

"We, along with the cast, writers and crew, are extremely appreciative of the show’s success and aim to deliver a final season, and series finale, that will bring The Big Bang Theory to an epic creative close.”

The Big Bang Theory has been a monster success since it debuted back in 2008. Being the number one comedy in the world is no easy task, but the series has held that title for several years.

Also, it also paved the way for Young Sheldon, a spin-off of the series focusing on the younger Sheldon Cooper. That show was a big success for CBS last season and has been renewed for Season 2.