My mom has been really weird lately?

With all that you've said, it sounds like your mom may be going through some stuff that she's not filling you in on. Depending on her age, she may have hormones that are all out of whack and she may be starting to go through menopause. She could be upset that you're starting to develop a life of your own and although it doesn't make sense to you, she's pushing you away. It does sound like she is going through a little bit of depression so approach the subject lightly if/when you talk with her about it. As a mother I suggest not taking this too much to heart. Moms are only human, just like you and we sometimes feel things that are unexplainable to our children. Sometimes we too do things we regret and say things we shouldn't. Talk to your mom, the way you've asked the question on here and maybe she'll understand that you're worried about her and have noticed a change in her personality lately. Maybe the simple act of you noticing and asking will make things less strained for the both of you. It's nice to see that you're concerned enough to seek a little help, maybe she should know about your concern as well. Good luck!