Shorten your name if you want. Just don’t shorten yourself to make other people comfortable.

Names get simplified for other people’s convenience constantly, and sometimes that is a reasonable trade you are making on purpose. What is worth watching is whether it stops at the name. There is a difference between offering a short version at a coffee counter and quietly flattening your accent, your family and your opinions so nobody has to adjust to you.

Decide which version you use where, and let it be your call rather than a flinch. If somebody asks for the full one, give it properly, pronunciation included.