Im 18 and depressed...help?

i would like to say i was a very confident,outgoing person in the last year or so i started noticing change nd i was goin threw some really tough times me nd my girlfriend broke up up after 3 yrs i lost my job my brother went to jail nd was lookin at serious time i lost contact with my friends because i was on house arrest nd it felt like evrybdy 4got about me my mother is a drug addict my father was killed when i was a child nd i was smokin alot while i was on house arrest then i quit 4 six months i also dont feel the same when im with my friends nomore its like no one is my friend nd i always feel like someone is sayin sumthin about me nd i have very low self esteem now its hard but i jus would like to let people no that im tryin very hard nd i would love to be myself again nd thank you all for reading hopefully i can write again nd tell evryone how good im doin