I really feel for you. Have you tried the standing on his lead so he simply can't jump on you? Whilst he may continue to nip your feet and legs from this position if you simply don't react at all he will stop eventually because it will be boring for him. Yes it will hurt you, but if he is restricted like this consistently he will eventually not bother. I can only say that this is how it worked with Cassie. You know there is a nice, friendly dog in there, as he matures and, with training the bond will deepen, you will see that more and more. As @UncleBob says time and patience is the key.