I don’t believe that there is such a thing as a bad feeling. Unwelcome, perhaps. Distressing, of course. But never inherently bad. Feelings are innate for a reason. Sadness creates empathy. Anger can spur on justice. Also, where would any art or literature be without distressing emotion?
We can’t control how or what we feel. Feelings come and go like tides. Sometimes you’ll feel angry about something that “shouldn’t” make you upset. The only thing you can control is your reactions to those feelings. Being angry about someone beating you in a competition is alright – you can’t control feeling that way. However, it’s not alright to go up and insult that person, or try to steal their trophy.
We feel irrationally about things because we’re human. Emotions do loopy things. The only wrong thing we could do is act out inappropriately. You’re not a bad person for feeling a certain way, even if you feel you shouldn’t. Avoid should statements with emotions. It won’t get you anywhere.
Take a deep breath and let the feelings wash over you. Like the flowers in spring, you will bloom after these rains.