There are a few questions to ask to gain a bit more insight:
When did you first realize you were suppressing your emotions?
Was there a situation (younger or older, past or present) in which you found yourself silencing your voice? What was the catalyst for that?
Which emotion do you have the hardest time with?
Are there any situations where you did acknowledge your feelings and what was that like?
Why do you feel (or what makes you think) your feelings don’t matter?
I always recommend journaling, it’s a great way to write without any limitations everything inside of your head, over time your thoughts and emotions become clearer.