How can i loose weight?

I am 19 (& a female) im extremely over weight . i have tried pills, diets,and even going to the gym. the problem is that I don't work well without motivation my mom trys then gives up and i end up giving up as well. I have also asked my boyfriend many times for his help but it seems like he dosen't even care. I dont know what to do. ive been researching gastric byp and summer camps but everything is just too expensive . can someone give me some advice.