Back at it

I've almost finished reading Macbeth by William Shakespeare. It's actually a very good story, and Macbeth is an interesting character, I can see myself portray. 
So I've done that, but I've also looked on the latest Casting Notices, and there are a few interesting ones I really want to apply to, but I'm too scared because I feel like i need to master my accent first. I don't want them to be like; "Oh, you talk very mixed, could you fix that?" then I'd feel pressured, so I really gotta work on my american accent first. This is what makes me so sad, why wasn't I born in AMERICA?? Everything would have been so much easier. They cast the most interesting roles there, the villains... Sweden only focus on the drama genre, and there are rarely any villains involved.  

Also I just learned there are plenty of more voice types than I thought. So I have to educate myself and learn them, if someone ever ask me to do a nasal voice, I'll be like: a what? (Even though I actually know this voice, It's like you're speaking with a stuffy nose) So I have a few things to work on from now on, starting right now! Gotta move to america, since; "the most important technique to improving your accent is to surround yourself around native English speakers and continuously receive feedback from them" Another thing to add on the list of things I have to do before I can begin my career. Or should I just stop over think everything and just do it anyway, maybe I should... hmm, so may options.