Lozz, I am sorry that you have had this to deal with at such a young age.
I will take a contrary view of what your doctor is saying. You didn't say how many lymph nodes were positive but radiation is advised when lymph nodes are positive. I believe you should get a second opinion from the best cancer center or large hospital you can get to. At such a young age you want to be as aggressive as you can. I wouldn't casually advise radiation, it is a serious treatment. However, it can be quite effective.
A second opinion is worth the trouble, please get one soon. I am not familiar with help organizations in your area but here are a couple of sites you might be able to contact.
http://www.qldcancer.com.au/ http://www.cancer.org.au/default.cfm Take care