Ignore your mother - that's all HER issues, nothing to do with you and your baby.
I only asked as to me the hardest part of breastfeeding is the beginning bit where you're getting it all established, and the easiest bit is later on when you don't have to worry about bottles and sterilising etc. It seems you're opting in for the hardest bit of both methods, if that makes sense!
Why not give breastfeeding a try, and see how you get on with it? You don't have to commit now to how long you will/won't do it for now.
There's loads of great ideas on this thread already and lots of professional support out there, so go for it. If you bet on with breastfeeding - win, if not, no problem, bottle feeding is also good.
Try not to discuss it with your Mum, sounds like she won't be supportive of you at all. Just think of a stock phrase to say to her when she asks. And repeat. Don't share any highs or lows with her about feeding, as it sounds like she will undermine you either way.
Good luck with it all. Exciting times ahead!