Help urgently needed?

Hi guyz :) Currently I'm not happy, close to bitterness but is sincerely trying to be nice to people to prevent myself from becoming bitter...My problem is that I feel like nothing is going right in my life currently, my mum has a serious medical infection and it concerns me like life is so crap and worse part is that only a few months ago, my aunt found out she has a deadly disease and it makes her complain all the time and i listen, my whole family is shaken by it...my Dad is so controlling sometimes and annoys everyone in the house with his forceful ways and inconsiderate words to my mum (eventhought some of it is out of his own fear)...my elder sister has never been an example to me in anyway, if anything she has been jealous of my academic achievement all ive know her till she left to uni (not that ive achieved amazing work but more than her but thats because i work harder), my younger sister is so obsessed with gaining as much friends as possible even indirectly supporting those who i have told her are frenemies with me and i have always been there for my little sister, i dont think ill be there for her anymore, ill let her ruin her life when i see she's going the wrong path now...my brother says i make people feel small sometimes (to me thats his opinion and im trying to avoid doing that, thats if i ever did) currently my whole family seem to find faults in me, whilst im trying my best to avoid trouble and help them all in whatever trouble they have but they dont even realise how sad and probably depressed ive been for the past six months....I have had so many moments where i just start crying heavily for no reason or because im fed up and praying constantly to overcome feelings of depression...after going through constant bullying and rumours and five years in secondary school for 5 years of my life, i had become slightly paranoid and now the problems im having with frenemies is bringing back those feelings ;( ....this is going to sound conceited but i dont know why but whenever i enter a room people turn their heads, and i only realised this year that i am beautiful but my so called friends are always mean to me whenever someone compliments my looks and they then try to belittle me and they always smile when something bad happens to me...mind u they are christains as well...nd now they are being nice to my little sister who i tink is so naive sometimes and thinks im lieing about their rude ways and gives them even more things to use against me by pointing out the things i cant do in front of them and being extra nice to them like she loves them (i never said she shouldnt be nice to them but i expected that with the things i told her about them she'd be more careful about she interacts with them).the most annoying part is that things seems to be going well for other people atm and not me nd i dont want to become a ***** or bitter because of that..i just want to get better..right now my family has disappointed me because when i had exams they were so inconsiderate and shouting about nd when i dont do so well my mum tells me that it is because im far away from God and my mum has never once listened or sat me down to talk to me about my feelings when she sees that im so low..nd i feel like i cant keep cutting people out of my life which is why i havnt cut those girls out of my life..why is it that i get along well with boys but ive never been able to get along properly with a group of girls..i do have other gd friends but they are not the ones in the same cles as me so i dont see them often..often surrounded with the frenemies....theres so much more...pls ask any questions that you think will help you give me the appropriate advice.....