How do I make him stop biting me when we go outside? I have a 4 month old half Japanese Spitz half Land Shark. 😭

Because for instance, he enjoys long walks except HE DOESNT WALK. He always tries to run. “Trying” because I hold onto his leash so tight just so he will not escape or reach stuff he’s not supposed to reach when we go outside. I take him out every day and he’s just always excited like it’s his first time. And when I do make his leash shorter just so he doesn’t get away too far while being crazy, he makes his angry sound and runs closer to me instead and bites my legs.

How do I help him to make this behavior stop? Because his bites really break the skin of my legs so I’m afraid he might get used to it because I can’t stop him. He has so much energy. It’s so hard to stay away while holding/making his leash shorter so he doesn’t get away too far from me but not short enough for him to reach my legs.