It's natural to be scared. It's important to be proactive in your health. It sounds odd that your ovaries would be protruding so much, could be swollen lymph nodes, who knows. The one thing I hate to hear is a doctor saying, you are too young to get cancer. I am sorry, but cancer does not discriminate. I am not saying you have cancer, but you have to be pro-active with you health, and you know that something is not right with your body and you don't feel right and you need know what test to demand.
good luck and keep us posted.
It could be some kind of benign cyst too. Most ovarian cysts are benign. I had some bathroom problems and a dull ache in my lower left side. I could feel a lump there but thought I was just full of poo. LOL Turned out to be a 10 cm (the size of an orange) cyst. They removed it, it was NOT cancer and thank goodness, my bathroom issues resolved. :-)
Don't put off getting it checked thoroughly. It sounds like you're scheduled for the transvaginal ultrasound. It's not painful but a bit embarrassing. Still, it's a better view of what's going on in there.