Yeah, I'd recommend talking to a professional.
If you really know this is the right thing for you, I'd say that you shouldn't let other people's feelings hold you back in your path. I'd say that for anything, though suicide is a whole different level. You have to be sure this is the right thing, it's not a decision that can be taken lightly. Though I guess you know that.
Your mother will be sad, but in the end I guess she has to trust you and be happy for you if what you've done is for your highest good. Not that she necessarily will be happy for you or trust you, but if she can't find forgiveness in her heart, that would then be her growth challenge and not yours.