Total depression

ok so im 15 always arguing with my parents I have 3 siblings one of em my twin sis so you think we'd be close but she never lets me hang out with her or sit in her room etc my brothers are twins and have eachother so im basically excluded to my room...

which sucks, my pparents probs see my as the worst child and im the youngest techinically but I feel so depressed like no1 loves me and im the cause of all problems when I try to be gd and I dont do anything wrong on purpose, im really smart in school but I never get praised because my parents say it takes me little effort but thats not my fault anyway so yeah theres that and then I can never sleep at night it will be like 3am sumtimes and im still awake or I never deep sleep I get anxious and panicky about the future and sad about death I really feel so alone and sad now but I dont let it show, I feel like im pointless in this world and theres no reason for me to be here but I never tell anyone because its not their problem im not emo or anything quite the opposite but yeah so..any help??

just make your own group and show your sisiter that you dont need to be in her group and stop being depressed

love nieya

haha we share the same friends but we arnt allowed friends over because my brothers always have there friends round my sis is only nice to me when I have our friends with us but that obv cant be eveyday