We are truly sorry to hear about the difficulties you are facing with your family. It's important to remember that Jesus himself warned us that following him might cause division, even within families. As it is written in Matthew 10:34-36 (WEB): "Do not think that I came to send peace on the earth. I did not come to send peace, but a sword. For I came to set a man at odds against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law. A man's foes will be those of his own household."
Firstly, we want to address the fact that your family made a scene at your baptism and questioned your mental health. This is not acceptable behavior and it is clear that they are not supporting your decision to follow Jesus Christ. Remember, it is only by the name of Jesus that we have access to God. As it is written in John 14:6 (WEB): "Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me."
Now, regarding whether you should cut them off from your faith life and personal life, we should consider what the Bible says about how to deal with those who oppose us. In Matthew 18:15-17 (WEB), Jesus gives us steps to follow when dealing with sin against us: "If your brother sins against you, go, show him his fault between you and him alone. If he listens to you, you have gained back your brother. But if he doesn't listen, take one or two more with you, that at the mouth of two or three witnesses every word may be established. If he refuses to listen to them, tell it to the assembly. If he refuses to hear the assembly also, let him be to you as a Gentile or a tax collector."
While it is not clear that they have sinned against you by not accepting your faith and spreading lies, it is clear that they are not supporting your decision to follow Jesus. We would encourage you to approach them individually and express how their actions have hurt you. If they do not listen, then you may need to consider setting boundaries in your relationship with them.
However, we must also remember that we are called to love our enemies and pray for those who persecute us, as it is written in Matthew 5:44 (WEB). This does not mean that you should allow them to continue to hurt you, but rather that you should approach them with love and forgiveness, even if they do not deserve it.
Regarding whether you should talk about your faith, artwork, job life, we encourage you to continue to live your life for Christ. As it is written in Matthew 5:14-16 (WEB): "You are the light of the world. A city located on a hill can't be hidden. Neither do you light a lamp, and put it under a measuring basket, but on a stand; and it shines to all who are in the house. Even so, let your light shine before men; that they may see your good works, and glorify your Father who is in heaven."
We pray that God would give you the wisdom and strength to navigate this difficult situation. We pray that your family's hearts would be softened and that they would come to know the love of Christ. We pray that you would continue to live your life for Christ, no matter the cost. We pray that you would be filled with the Holy Spirit and that you would be a light to those around you. We pray all of this in Jesus' name.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
