Wow. Thirteen responses in and nothing helpful. Ok, well I'm taking all this at face value since I have actually had suicidal family members before, and know how painful that can be. Apparently I have to be the first one to actually try to help. Thanks internet. Ok so first off, you have done nothing wrong. I know this seems pretty obvious from a logical perspective but it can seem hard to see it that way considering your mothers reaction. There is nothing wrong with you period. This is something you need to deal with and accept before you can do anything else here. Now I can't speak for whats going through your mothers head right now other than the fact that she clearly doesn't understand your interests in this at all. It might seem like a good idea to try to explain it to her in the best way you can, but thats also what websites like this are for.
http://understanding.infantilism.org/
If you can convince her to go through this or other material you can scrounge up, it might help her realize that A: This isn't unique to just you and B: There is nothing wrong with you. But that all comes down to her. If she is unwilling or unable to look at the material objectively then that's a problem with her and not you, and you shouldn't feel burdened by the guilt she should feel. Honestly I haven't told any of my family for personal reasons, but if they weren't willing to accept it, I simply wouldn't bother with them anymore. But I do admit that I am lucky to be currently living in a situation where that is possible and easy for me to accomplish and this doesn't apply to everyone.
tl;dr This isn't your fault. Nothing is wrong with you. Try to get her to look at objective, researched material on this subject to help her understand you better. And if that doesn't work, well, shes not exactly a great mother is she? Sorry if thats harsh but I mean, really that does feel like thats what it comes down to, to me. Hope this somewhat helped.