Need motivation

Noelle • I`m 27!! and a landscape/nature photographer and fur mommy!
I need motivation. I keep talking about how I hate that I've gained weight since I met my boyfriend. Lol too much Mexican food I keep saying. I want to loss weight but ever time I try to work out I either do one day of workout or just put it off. I've tried doing yoga as well and did it for a few days and then I just stopped. I told myself oh I'll do it later. I really need some motivation. My clothes feel like they are getting to small.