Staying motivated

I can not stay motivated to lose weight.  I have so much stress in my life (my mom) she talks about my weight all the time. The only clothes that fit me are my sweatpants (I wear them everyday). the stress and the way I see myself discourages me. I need help to have the positive instead of the negativity in my life. I'm not happy, my body hurts all the time, I'm always tired even if I do get enough sleep and so much more. I ask my husband and friends if I'm pretty because I  am so self conscious now everywhere I go I feel like someone is staring at me. I never felt this way when I go places.