Frustrated!!

I had a baby 2 years ago in April, I also have a 10 year old. After my 10 year old I lost the weight and more, granted I was a single mother and didn’t have a family meals and demands from the family. I have struggled this go around with loosing the last 15. I try to get up in the morning to walk (4:45am) but it runs it toll on me, I do walk on my lunch breaks and usually get 1 1/2 to 2 miles in. I eat a protein bar in the morning and that is it until dinner. I do occasionally come home and have a beer with husband (mainly in the winter months, I try to take the baby for a walk when it is warm out). I know my body is different than it was 10 years ago with my first but I am getting so frustrated with myself. I feel like I am not eating much and it isn’t making any difference. I average going for a walk at least 5 times a week, I don’t sit down at night until I go to bed. I want to enjoy my life and not focus on my body but I am so disgusted with myself. I refuse to buy bigger clothes so I feel like everything is so tight on me. Any pointer to help me see some improvement??