I'm so sad, my mom says that because of the way I treat her my children will be 3 times worse..?

It makes me feel so sad. I want to have kids when I grow up and a family but when she says this I feel like she's placing a curse on me.. and I get scared.. I am under so much stress lately. Actually at all times. I just feel like no one cares. I'm at this point where I'm really really sad. And I don't know what to do. It's like I'm all alone and I only have my family but... they're far from comforting. I can't stand my mom... She's bitter, judgmental. She loves to talk the talk but I don't ever really see here walking the walk and it makes me so mad. More than anything I just want something stable in my life. But I feel like there is nothing I can lean on. She always gets mad and always goes on these long rants. It gets to the point to where I can't stand to hear her voice. I can't stand anything she does. Like what happened is she misunderstood something, she "assumed" I did something.. but I didn't. And she began speaking with that annoying angry tone of hers and I couldn't take it. I told her she was wrong and to leave me alone to stop talking. I couldnt stand her voice anymore. It just made it worse and she got all defensive and started ranting and I got up to leave and thats when she said that the way I treat hear will impact the way my kids treat me. I'm so tired. Why can't she be the mature one. Who calmly reasons things out instead of hotly launching into her stupid rants and lectures of how terrible I am before she even figures out what really happened.