It's really hard for me to answer questions like this without casting and interpreting a complete birth chart. I can't see what signs your other planets are in, or what houses, or what aspects your planets make to each other. You had to go on a site to get your ascendant, didn't they offer an explanation of your chart there? Unless you did the work and cast the chart yourself.
Aquarius is a freedom loving sign, and you don't like conventional relationships, so that could be one reason. Aquarius is ruled by Uranus, and you make sudden and erratic changes. This can confuse others.
Cancer rules your emotions. Cancer is a loving and nurturing sign. But Cancer's ruler is the Moon, and it travels through all 12 zodiac signs in a month, so you also go through little changes every 2 days or so. So that Cancer/Aquarius dynamic can try the patience of say, an Earth sign person, or someone who isn't up to a lot of change. Plus an Earth sign would bore you to death, I'd say no to that.
Sag people seem really friendly and outgoing, and usually don't judge others. They accept everyone and make others feel at ease. So that's not causing the dating issue.
Even though Cancer and Aquarius are changeable signs, there are many Cancer/Aquarius couples. I think it's the fact you need some space in a relationship and although Cancer loves security, Cancers need alone time, so also need space. You need someone who honors that and accepts you are a nonconformist. I hope that helps a little. Try an Air sign or Fire signs. Hang in there. Sometimes we meet someone great when we aren't looking.