Mother thinks a mobility aid would be "handicapping myself"

I'm an 18 year old college student living with my mom due to the fact that college is expensive, plus my disabilities would make living on my own quite difficult. I feel like I would benefit from a cane/walking stick due to fatigue, occasional knee pain, and stability issues. I've brought this up to my mother before and mentioned all the points above, but she got all weird about it and says she doesn't want me "handicapping myself" and then when I got upset about that she got snarky and said she was sorry she wasn't jumping for joy at the idea. Then she started pointing out all of the downsides until I dropped the subject. I really still want one as I feel like it would really help me feel better at times but I don't feel like I can get one if I would have to live under her judgement every time I use it. She swears she understands my disabilities, but I just don't think she does. Does anyone have any advice on how I can change her perspective?

Edit: I would like to add to this, a cane wouldn't be something I use all the time, just something I stash in my bag before leaving the house for my bad days and flare ups, or for activities that involve lots of walking. Things like theme parks, the mall, all day outings, walking my big university campus, etc. and for the days I feel like absolute sh*t. I'd likely spend more time walking independently, rather than with it so I'm not super concerned about things like shoulder/arm issues considering those joints would have long rests in between use of a cane.

Edit 2: I am not looking for permission to use a cane from anyone online, I am not thinking about mobility aids without also thinking about the condition(s) that may be causing me to need one. I am not looking on reddit for advice about if a cane is right for me. No, I have not seen a doctor in a while due to health insurance problems, yes I will be seeing a doctor soon, yes I am planning on asking whatever doctor I see for advice and possibly seeking a physical therapist, I am aware of my diagnoses and of a main illness that I am suspecting and planning on seeking out a diagnosis for. All I was asking about was advice on dealing with my mother. I felt the need to clarify this due to a large portion of comments completely misunderstanding what I was asking for.