<human>: I have a 7 month old German Shepperd/Black Lab mix pup. He seems scared of everything. He plays quite a bit in the house (which will turn into a problem as he gets bigger) and plays a little in the back yard.

He refuses to go out the front or garage door (towards the cars) at all costs. I'd say this is probably due to the minor wreck that he and I were in. Poor guy flew into the floor. Before that, he was still really skiddish around cars, but now he just refuses to go near it.

I try exercising him during the day but he doesn't like being outside. If I carry him out there, he just sits by the front door. I've gotten him to play a little and even run with me around the block but he is never too interested and always ready to be in the house.

Note: this is all if I open the front door or garage door. I could leave them both open over night with him loose and he wouldn't go out of them. He has no problem with the back door.

How can I fix this. I'm a pretty active person and I really wanted my dog to run with me while I ride my bike and skate. I was expecting him to naturally enjoy the outdoors and I'm really worried he won't be to excited about the water. :/

Can you give me a shortened version of the text?
<bot>: my 7mo old puppy doesn't like being outdoors or anywhere near a vehicle. This is problematic because I am very active and would like my dog to be with me on road trips and bike rides.