Discouraged Today

I've been thinking a lot about falling in love, getting married and starting a family recently. The more I seem to think about it and where I am in life, the more discouraged I get. I can't seem to settle down no matter how hard I try and every quality girl I know wants a guy that will settle down. I don't want to lower my standards just to get what I want. Every time I find a great girl I like who likes me back she backs off due to the instability in my life or it doesn't work out. What can I do? I want a family, a wife, children, but it's so discouraging. I don't know what to do. I just want someone to tell me what to do.