I think one of the bravest things a person can do is uproot their life and come to a new country. Many of the simple pleasures that make life comfortable aren't there when people immigrate. You're right - you probably aren't treated as well as if you were born in the country you live in. I work in an area where there are a high number of workers from India. They get paid less and treated like less.
I bet lots of people think when they hear about American minimum wage that they could easily live off of what qualifies for poverty in the US - but the problem is that everything costs so much here and a certain standard of living is expected, especially if you work at a professional job.
I don't know if you made the right choice or not. Are there any people from your culture around? Is there a meet-up group, maybe?
I'm faced with the problem of should I work tons or do I work enough to maintain my mental health. It's hard. I think, "hmm, if I took that extra job, sucked it up with my boss is unkind and asked for more hours," then I could make more and maybe have some more security, but it is very difficult to not become overly stressed. Something else to consider is that maybe you're in the wrong part of the country. If it is a big country like America, then there might be places that are more inviting. It's a tough time to be a grad. I graduated last year from grad school, my boyfriend graduated this year. It's not easy.