How to avoid snacking?

I'm okay in my eating choices, but what really bothers me is my uncontrollable snacking! It's as if food is my drug. I feel as if I am borderline with my weight and want to take more control by avoiding snacking. When I am in my room and I get an idea for the ice cream cone in the freezer it almost engulfs me. I even tell myself I can do without it and I don't need it, it's just a mess of empty calories but it is as of my brain overrides these thoughts and I always end up walking to the kitchen to get it. I live wi my dad and sister so I can't dictate what my dad buys because if he feels like he wants an ice cream when grocery shopping, then he'll buy some for the house. My problem is self control. It is overwhelming. And there are alternatives for me that are healthy, but when I want ice cream, there is no chance I'll be satisfied with substituting that for carrots. It's about taste, not hunger with snacks. Has anyone had/has this problem? I need tips for this because it almost makes me feel ashamed that I have no control. Anyone know what I'm going through and got over this?