Awkward intimacy

So my and my other half have been together for quite a while now and we're madly in love but sometimes i feel whenever we have sex its a little awkward..like sometimes he'll struggle to put it in easy or he'll stop when he's about to come. He also gets really shy about himself..But other times its the best sex i've had..how can i get rid of the awkwardness? Am i just overreacting? i just want a little more sometimes..