It’s awful for you to feel like this and I completely get that this is the truth for you.
About wanting your husband to pay attention to you to give you confidence, try to think of it in a different way. Your confidence comes from inside YOU, what you think of yourself, what you think you’re worth, not from another person, even your husband.
You’re in your 20s, have a lovely daughter, what could be a better start to your adult life? You have so much going for you and things can get even better.
A woman’s body does change after having a child so that basic fact won’t go away. You could exercise though, or do yoga/Pilates if that will help you to feel more as you would like. Stretch marks fade and become unimportant if you’re fit and feeling good.
Your DH is away from home for long hours but he’s home and awake late morning so you could prepare a nice lunch or go out to eat. Same on his days off.
To get closer to him, maybe think of making the first move, especially once you’re more confident about being toned and fitter. Tell him you’d like to be closer and I’m sure he’ll respond.
And find out what the opportunities are in health care for you. I’m sure you’ve got skills and personal qualities you can use.
Think of your life is just beginning, and you can make it pretty much as you’d like it to be. Go for it!