am i depressed? can you help me?!

im 21, female, i have a baby she's 20 months now.. her father is far from us and we are not yet married...my family and i migrate here in the us a year ago.. i'm living with my family now.. i have some trouble being with my family.. im always crying inside my room, i spend my day just taking care of my baby and on the computer.. every time my parents is talking about me i easily cry, i lock myself with my baby in our room i let her watch tv and i cry..

and i came here i was pregnant so i gave birth here in the US, i have no friends, i have relatives here but i really talk to them much.. and after a few months after i gave birth, my best friend died.. i was so lonely at that time.. i cant come home to our country because i have a baby.. and until now i always crying because of my best friend.. and one of my concern is i haven't finish my studies im always thinking of working but there's no one to take care of my baby..

i always have headache, and i gained weight.. when i was pregnant im just 130 lbs and now my weight is 151 lbs... i cant stop eating, it feels like when i don't eat i will be restless,, i also sleep 2am everyday and i wake up around 7, i always cry, i feel hopeless im always thinking, what if i kill my self with a knife or take a pill.. im always thinking it especially at night when me and my mom have an arguement or when my father says something to me and i didn't like it .. or sometimes if im really tired of taking of my baby because im the only one taking care of her... sometimes i have thoughts of ending my life so i wont have any problems or i wont have to cry a lot.. because i have no one to tell my problems.. & im thinking that my friends tired of hearing my problems because talk too much, or they found it uninteresting..my best friend died and im far my other friends and they have new friends now so i keep myself far from them... i just try to keep my problems to my self and cry on it trough the night.. but sometimes i feel happy because of my baby.. i also have muscle pains.. and also om always mad or angry to my brothers and even to my self and to my parents..

for me leaving with them is like a hell, i lost my freedom, i don't know anybody i don't know the places here,i cant go to the places were i wanna go i cant even laugh just like before, i think i'm a bad person,

i have read the symptoms of depression but i just wanna make sure if i'm really depressed or just a drama.. or if this is a real depression what should i do? should i tell my parents? how will i tell? and what if they don't believe me?

im sorry for my grammar because im an Asian and i still learning on it.. .. i hope you have a lot patience on reading this.. thank you