I gave up what I loved for a stable job and I regret it. What now?

You traded something you genuinely cared about for security, and now the regret sits with you. It is a hard, quiet kind of ache, because you cannot say the stability was wrong, and you cannot say the loss was worth it either. Both things are true at once. The choice you made was not foolish. Stability matters; you likely had good reasons, real needs, people counting on you. Do not beat the younger version of yourself for choosing safety. But do listen to the regret, because it is telling you something still alive in you that has not been fed. The calling is not necessarily gone, only set aside. You do not have to blow up your stable life to answer it. Start small: give one evening a week back to the thing you loved. See if it still breathes. You may find you can hold both the security and the spark, if you make a little room for it.