Ovarian cysts are very common and are not usually cancerous. I'm guessing the reason you're getting this one removed is the size. They will do a biopsy on the cyst once they remove it. I'm sorry you're having so much anxiety over it in the meantime. I have a cyst right now that needs to be monitored and I have also had another one removed a few years ago. I hope everything goes well.
Hello,
A complex ovarian cyst is less common than simple ovarian cyst. At such a young age it can be dermoid cyst which is a type of complex ovarian cyst and is the most common type and develops during the childbearing age. Complex ovarian cysts are generally benign. The risk of malignancy is generally higher among postmenopausal women. Since you are 34 years of age, chances of malignancy are less.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.