Is it half full or half empty: Realist/Idealist

A few years back I was sitting in my kitchen talking to my mom about realists and idealists. Up to this point for whatever reason i had not heard of the expression of the glass being half empty or half full. So my mom grabbed a glass out of the cupboard and asked me what do you see. Now not knowing i said "A glass of water" my mom replied "and its...?" I then came back questionably with "half empty" she told me about how my grandma was always the positive one that viewed the glass at half full. Most of the time i like to view myself as positive wouldn't everybody? But at that moment I realized that i was a little bit of a realist. This kind of thing made me a little sad i always believed that I was sort of an idealist but i thought about and I do have some idealist qualities like always being thankful for what i have but also being a bit of a complainer.