Help Doodle rather go inside than out.

I have a 6 month goldendoodle, when we got him it was very cold out winter. We trained him on the potty pads, so now we walk him all around the yard for a good 30 minutes and he won’t go out side,when he goes back in he goes on the pads. We then bring our 6 year goldendoodle out and he goes outside than the puppy just wants to play. How can I get him to go potty outside? I really need help on this, the bigger he gets the more pads I go thru. Help!