That's what emotions are trying to do. They want to get your attention so that you'll listen to their message. The message of a 'negative' emotion (an emotion that feels bad) is "Hey, you're misunderstanding something. Look again!" If you don't listen to your emotions the first time they are a quiet whisper they have to resort to blowing your house down like the big bad wolf.
By emotion I mean the surface level fluctuating energies we have in our bodies such as anger, fear, contentment, sadness, guilt, excitement, shame, happiness, frustration, etc.
An emotion is different from a deeper, quieter feeling that comes from our intuition which is usually felt in the heart or the gut. These deeper feelings are direct guidance we can learn to trust once we distinguish these feelings from emotions that can come from believing the voice of our ego.
Mastering your emotions is very different from trying to control them. With mastery, you acknowledge, accept, and allow your emotions to flow through your body without needing them to be any different than they are. You give your emotions your undivided attention and embrace them non-judgmentally with your loving presence and consciousness. As you do this, Love seeps into the chaotic energy of the emotion and gently allows it to transform. However, the emotion will not transform if you have an attachment or an insistence on how or when it transforms. That would be fear and control, not love and allowance.
To process your emotions instead of suppressing them, you need to open up your heart and breathe deep and slow. Staying rigid and tight in your body and shallow in your breathing, trying to keep the emotion at bay, will only make things worse.
When your emotions are allowed to process (vocalizing them helps enormously such as saying "I feel hopeless, I feel alone, I feel inadequate") your perspective will naturally shift as well. You'll go from believing someone shouldn't have said something mean to you, to understanding why they did and even feeling compassion for them.
Mastering your emotions also means that when you're in the heat of the moment and triggered by some event, you don't immediately react in an unconscious way that potentially spreads the negative emotion to others. Instead you acknowledge that you're triggered by this event and take whatever space you can to feel the emotion and process it before you speak or act. If you are under pressure to respond to something immediately, you still have a moment to catch your breath and briefly reflect so as to say something from love and not fear.
This isn't to say that mastery is some final state where you never get upset by emotions because while we're incarnated on earth there's always going to be something in us that may get triggered by a certain situation. Mastery is when you almost always respond consciously instead of react unconsciously to your emotions.
In a certain sense we are already spiritual Masters, we just need to realize that. In other more practical sense, emotional mastery is a journey that takes courage and effort, but not the kind of effort that has you even more stressed out than you were before you tried to have greater mastery of your emotions. It's the effort of choosing to feel uncomfortable emotions when it's easier to eat some chocolate or whip out your phone.
My own journey with developing emotional mastery started almost a decade ago when I was buried under the weight of deep depression and suicidal thoughts. I couldn't see the light at the end of the tunnel but I had a feeling that I would ultimately be okay if I just stuck around long enough to see my way out of this pain. I didn't have the knowledge or the awareness I needed to make things easier on myself. I wish I had known that it was OKAY to feel bad and that the way out is through honestly facing and feeling one's uncomfortable emotions. And that crying is healing, not weak.
Just a few years ago I had a moment of fierce courage where I stood up in front of a conference of several hundred entrepreneurs and shared my struggle with mental illness and how I really did have emotional mastery. I was greeted with a standing ovation and many people came up afterwards to share the story of how they or someone they loved had also struggled with mental illness.
Today I know I still have much progress to make but I am much more aware of my emotions and they don't sabotage me nearly so much. I've been able to feel fear and doubt and act anyway. And the more I did, the bigger the challenges I could face.
If you're facing similar challenges, or even seemingly mundane ones, I'd encourage you to treat your emotions more like children that need your love and attention. Acknowledge them, listen to them, and feel them. You will be better for it.