I think you may find that, yes, radiotherapy can cause burns, but that the overwhelming majority of people recover very quickly. It is not like sitting out in the sun; being fair skinned does not mean you will automatically get worse burns.
It is tiring and time-consuming, particularly if you live in the country, but if the burns are your main concern it is possible that talking to a few more people who have done it may help.
I had 30 rounds to my axilla and sub-clav nodes. I ended feeling like a BBQ chook for about two weeks then it was all over as far as the burns were concerned. Uncomfortable? Yes. But I'm not scarred and it was not at all like I had worried it would be.