Solo on the right seat?

[zerograv]

Hi there!!!

Just wondering if it is illegal to fly, by my self (solo), on the right?
I have no Instructor Rating.
Recently did some time building and, since what might come next,
could be fly on the right, I took the opportunity to try to get used
to fly on the right. First went up with a friend on the left but then
did may be 20hrs solo on the right. Someone at the airfield told
me that, since I don't have an Instructor Rating, this flying solo
on the right would be illegal.

Thanks for your inputs.

Regards,
Zerograv