How to be less insecure?

I am not in a relationship but I feel that if I do get into one I will be constantly worried about what my partner thinks of me, and I will ask her over and over if she loves me. I might always need her around telling me how much she loves and supports me because I hate being alone. Before I get into a relationship I want to wipe out this problem of needing assurance from others all the time. I want to be okay if a girl does not automatically like me, and not ruin my day over it. How do I become less insecure?
How to be less insecure?
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