I like this girl but she is too pretty?

I really like this girl who I knew from way back in the day (I did not see her in that way back then but only because my and her families were quite close and) but she is an absolute stunner and that has stopped me from getting in touch. Cheesy I know, but she has got one of those cheeky catching smiles.

But it is not just that; it is hearing from people saying people in a similar situation ‘you have no chance with her so you should lower your standards’ which has damaged my self esteem.