i want to put a bullet in my head

It's very cruel that ur Mum speaks to u like that, parents are the ones who are meant to reassure us that everything is going to be ok, not knock us down and I'm sure the things she says hurt a lot more than others cos she's ur Mum.

When I was in my v.early teens I developed psoriasis due to stress from constant problems with my Mum as well (slightly different we clashed as she suddenly became religious) but as our relationship improved and I became happier it kinda disappeared so I know how emotional problems can affect ur confidence and appearance. Like redvelvet has said go and see a dermatologist regarding ur skin problems, even when severe, these problems can be treated nowadays with things like tca peels, laser etc. and as ur confidence in urself improves u will prob find u'll start doing better in studies or job interviews. See a doctor abour ur hair loss and like others have said try and eat healthily. Spend more time with friends so u have a good 'network' of support that will hopefully prevent u from feeling too down, the more time u spend on ur own the more u'll tend to dwell on things and end up feeling more and more depressed.

Please try and start to take positive steps so u can get urself out of this situation, I know it's really difficult but if u don't try and pull urself up u may end up falling even further, the sooner u deal with it the sooner u can get better and inshAllah start moving forward and enjoying ur life. Ur only in ur early twenties u have ur whole life ahead of u, job, independence, having a family, all the best things are still 2 come :)