Yeah I felt like this for quite a while and it's perfectly normal, happens to everyone. For me when I met someone in my eyes who was better then my ex then I finally thought there are people out there better then him. He kind of disappeared in my mind then. But it takes a while to get to that's stage. I went through some low self esteem moments too. It's all totally normal. The Xmas period always tends to highlight the fact you are single but think about all the rowing couples out there and be thankful your not one of them