Since we're discussing a Sacrament of the Catholic Church, where only a validly ordained priest of the church can consecrate bread and wine (not a lay person) into being the Body and Blood of Christ, the Church has full rights to decide who is eligible to receive Communion in order to not profane the Sacrament. By creating rules regarding reception, the Church does the best it can to prevent blasphemy and/or sacrilege from occurring. Since priests are the ones entrusted with the Body and Blood of Christ, everything regarding reception is under their, and the Church's, purview.
Without rules regarding reception, blasphemy and/or sacrilege would be more rampant than it is today.
No, I was discussing communion, something common and available to all believers in Jesus Christ as Scripture teaches.
If you want to put yourself under the rules and canon of the Catholic Church that's your choice. But communion as laid out in Scripture is available to all believers.