I need some help!

Hi everyone, I am turning 27 and cannot seem to keep my weight off. I lose a pound here or there but then just gain it back again. I try counting calories and I try exercising but I do well for one week and then lose motivation. I really need some help from others if possible. My current living situation restricts me quite a lot. I do not have any transport, and my friends live far away from me. I am not working at the moment (meaning I'm home 24/7) and cannot get to a gym. Any help or support out there is welcome.
Thank you