Υοu shouldn't worry. When I first started it would take me 40 mins to walk a mile.

Now it takes me 15. You'll get better as you try.
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I've found that stair training does it for me. I've increased my speed twice over by stair training at least 3 times a week.
Stairs are **** on your knees. My aunt broke her knee and her doctor told her that her knees were in a pretty bad shape. She told him that she kept going up and down the stairs all the time, so she thought that she would have strengthened them, but he said that she was doing the exact opposite. And I'm knock-kneed and the first thing my doctor told me was to avoid the stairs.