Rottweiler

2 year old Rottweiler, not yet neutered, very happy loving boy but can be nervous of new people, he loves playing with toys and balls, walks nicely on a halti,
I haven't been able to get his recall up to scratch to let him off as he gets distracted very easily, he is also nervous of people when out in public but will just back away from them and not want them to touch him (he was great as a pup but as he got bigger people got nervous of him which made him nervous of them)
He's good with other dogs but quite boisterous, he's just got no concept of how big he is.
No cats or children.