I'm sure he'll settle down - particularly when he's been neutered.
Bella was a terrible nipper when she was young - she was around four months when I got her last July - and she bit, scratched, kicked and lashed out if I picked her up. I had bruises and scratches all over and it does make you very wary of them. Try not to show him you're scared of him (which is not easy cos it blinking hurts) because they can tell - I used to say NO very loudly or screech to Bell and it did work to a point, but until she was spayed I basically did what I could to avoid it happening. Having her spayed had an amazing effect on her, and a year on, although she isn't a cuddle bunny, at least the nipping has stopped.
She's a feisty female though, and my experience of boy bunnies (though admittedly I've only had two, with four girls) is that they are real cuddle bunnies - my previous bunny Harvey, once he'd been neutered, became the soppiest, gentlest, cuddliest, most affectionate bunny I've had.
While it's warm can you go and sit in the garden with him and let him explore you? Let him climb all over you without responding or touching him.