Jesus inaugurated the worship of Himself when He arose on the Lord’s Day i.e. the first day of the week.
The sabbath is of the Old covenant. If you are Christian, you follow the New covenant - the Lord’s day to worship.
You have it backwards. Jesus kept the Sabbath and rested in the tomb. Jesus kept the Sabbath His whole life. He stood up and recited in the synagogue on the Sabbath. Mark 2:28 He is the Lord of the Sabbath.
Matt 5:17,18 Think not that I am come to destroy the law (as the Pharisees and Catholics say) till heaven and earth pass (that hasn't happened yet) not one jot or tittle will pass from the law.
If ye love Me keep My Commandments. Too many do not heed this verse at all claiming to be Christians. it's not stylish. If you are a Christian you will follow His example and His words and not the cunning wisdom of the snake in Eden that has bewitched you with "Did Jesus really say to worship on the Sabbath"?
Of course you may worship Him on Sunday or any day of the week. But the day He requires you to set aside is the Sabbath. It was instituted at Creation. It was wrote on stone tablets and God changeth not. The Ten Commandments are inviolable. Sacred and not to be shattered and cherry picked at your whim or desire.
Matt 24:20 Pray that your flight [from persecution and suffering] will not be in winter, or on a Sabbath. This event happened many years after His death. This enforces the idea there was no changing of the Sabbath. But the Sabbath was predicted to be changed Daniel 7:25 And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws. So following the New Age thinking of Sunday as the new sabbath comes from the anti-Christ.