It isn’t sinful to receive a blessing, but whether or not you should go up during Communion to receive it is something you should ask your Priest about. Not every Parish recognizes this practice. Also, only the Priest and the Deacon can actually give you that blessing. The “Extraordinary Minister of Holy Communion” isn’t supposed to do this.
There was another thread on this awhile back where a great article was linked in. I’ll see if I can find it.
ETA: Okay, I just saw 1ke’s explanation. Her comment is correct. I’ll still see if I can find that article…