Sexual stuff in new relationship

So I've recently gotten into a relationship so it's new stuff anyway I was giving him a handjob/ blowjob and he was taking ages and like wouldnt cum and he eventually told me no girl has made him cum he usually has to finish himself off.. 
It made me feel really bad at everything in that area so can anyone offer some advice to like change that. 
As in I want to be able to make him feel more good and u know... 
So any advice??