BOSTON -- Whether swimming, snow skiing, ice skating or playing softball, 14 year-old Caitlynne McGaff does it all. And she does it all with only one "real" leg.

NewsCenter 5’s Liz Brunner first met Caitlynne four years ago when she was 9. Back then, her favorite activity was gymnastics. She'd already endured chemotherapy and had been living with a prosthetic leg for two years following her battle with Osteosarcoma, a rare form of bone cancer.

Watch Story | Caitlynne McGaff: Losing Her Leg In Lake | Keeping A Positive Attitude | What It's Like To Have Prosthetic Leg

In order to give Caitlynne the best chance of survival and to remain cancer free, doctors performed a complicated procedure called rotationplasty. The surgery amputated Caitlynne's right leg above and below the knee to remove the cancerous bone, but then reattached her right foot, with the heel rotated, to serve as a replacement knee.

"I'm definitely glad that I chose that because it really allowed me to live my life like a teenager."

Caitlynne said she is still amazed that her right ankle now acts as a knee, but that it feels completely natural, "like a regular leg." She proudly admits she has great balance, too.

Caitlynne said there is one sport that is a bit difficult, "The only problem with it is my knees are uneven, so bike riding is a tad bit hard. When I'm done growing, they're supposed to match up."

"I think it helps that I had this when I was younger so I really didn't have any cares about how I looked. Back then, I was kind of like, OK.”

She also didn't give any thought to trying to learn how to do things differently than other kids, a positive attitude modeled by her parents.

"She doesn't let what others would consider a disability get in her way," said her mother Doreen.

Nor does Caitlynne make any excuses or feel sorry for herself. Caitlynne said when you look at all that has come out of this experience and what she's learned, her cancer and subsequent amputation was a "good thing overall."

And she has big plans for the future.

"I have a fantasy! I want to be a school teacher, but I want to marry a rich man. I love working with kids, so I'd get to work with kids, but then, if the rich man is a doctor or a lawyer there's a little money that I can spend.”

Until then, Caitlynne will continue to tackle the life of being a teenager, and speak to other kids that are fighting cancer. Her message is simple: that they are not different and can do anything they set their minds to.