Having a name that's difficult to pronounce or spell is no impediment to film industry success. If anything, it's the opposite. You're going to want people to remember you and people remember unusual names much more easily.

However if you want to change it, but you're worried about how your mom and stepdad would feel, I'd advise you to talk to them about it first - perhaps just your mom initially. That way you'll know how they'll feel, which will help with your ultimate decision. Okay, bringing up the subject may be a little upsetting in itself, but not nearly as bad as just doing it. And you might find that they don't object at all, which will make your life simple.