I dont know if you would call this starting over or starting anew

I am a 23 year old, 5'1" 168 lb female. I have tried multiple time to start down the weight loss road but I feel like I'll keep it up for maybe two weeks before I fall again. Right now I've got a lot of work related stress and on top of that, I'm planning my wedding. I want a lifestyle change, not a skinny body at my wedding. I want to know that when I have children I wont fall behind them. I've always been good at exercising, I jog around 5 days a week with my dog but my knees ache from those extra pounds I'm carrying. I'm hoping that if I check in regularly here I can keep myself honest. Thank you for listening internet land! I'll check in with you again soon.