* Tha mi cudromach: This translates literally to "I am important." This is a good option if you want to emphasize your significance or value.
* Tha mi deatamach: This translates to "I am vital" or "I am essential." This option works well if you want to emphasize your necessity.
* Tha mi air mo bheachdachadh: This is more nuanced and translates to "I am considered" or "I am taken into account." This works if you're talking about being recognized or valued.
* Tha mo bheachd cudromach: This translates to "My opinion matters." This is a suitable option if the context is about the importance of your thoughts or perspective.
Which one is "best" depends entirely on the situation. If you can provide more context about *why* you want to say "I matter," I can help you choose the most appropriate translation.