I would test the SWR (stand wave ratio) of your system. It tells you how much energy which is going out is reflected. With a device like this: (there are others which can do the same)

https://www.radioworld.co.uk/daiwa_cn-101l_meter_1_8-150mhz

And by the way: do you speak loud and clear when you transmit, and close to the microphone... ? 😉

Did you mention what type/brand of SSB you have?