PD downloads chucks and bits of other people stuff into Unity. Those chucks and bits can then be uploaded to other users.
However, your bandwidth statistics not only counts what you downloaded or uploaded, bandwidth used to search, query, and (failed) ATTEMPTS to connect other users counts are added as well. Just because the number says X amount kilobyte transferred, NOT all of that is actual P2P data transfer.
Unless there is a specific reason, I strongly advice against using PD at your low upload speed. I cannot upload effectively with PD from my home too, and my upload speed is about 2x of yours.
Your maximum upload speed is lower than the number you can set for
Share. However, I think you may be able to try Share.