There are ready-made boards for this being sold for less than $2. Just search "eMMC Adapter 153 without flash" on ebay. 153 is number of balls on the eMMC chip

There are ready-made boards for this being sold for less than $2. Just search "eMMC Adapter 153 without flash" on ebay. 153 is number of balls on the eMMC chip OP is using. You might need a different adapter for different eMMC chip.