How do I overcome my fear of making advances on women at work and at university?

I have very limited opportunities to meet women socially because I'm very busy with making a career now. At work I feel it's inappropriate and at university nobody flirts or does anything and it feels like breaking social rules. We never go out because it's a part time course and we barely meet each other.

How do I overcome my fear of making advances on women at work and at university?
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