should I move?

eat out and don't tell them ......when they don't have any food they will soon find some

Why not just talk to them instead of leaving? Why move out when you can talk to them and tell them how you feel? If they cannot respect that you work hard for your money to get food then you tell them you will stop sharing and buying food if they do not respect your wishes and that you will only buy enough food for you and your daughter. Hopefully they get the memo. If they still don't or they keep taking your food you can either stop buying them food and sharing it with them or just find a place of your own but if this were my situation I would only use moving out as a last resort as that would end up costing you more money in the end now that you will have to pay rent (and probably a lot more) once you move out.

Move, and don't invite them over for dinner. You are being used. It would be okay if they shared with you, but you say they don't, so take your daughter and move. You'll be happier.

It all depends on what you fill is right , you could tell your family if they don't start contributing then you will leave.

Have fun with your move.