I like a girl with a boyfriend and she may have hinted she likes me too. We are both shy so I'm not surprised things are going slowly?

And I don't want any "she's happy, leave her alone", replies. I like her and I'm going to try for her anyway. I'd just be interested to hear what you all think e.g. how could I show I like her, does she really like me?

P.S. We are still in secondary school