You have to make a difference between these words.
But not just by ear, study them using the buttons and Praat, record your imitation and let yourself decide when you say it.

• In the box below, select the sound you want to master.
• In the box next to it, select the other sound.
• Select the box next to "Keep" so that the words are kept by the number of times you select in the box next to it.
• With the buttons you can hear the pronunciations of the associated word.
• With the buttons You can watch videos from YouGlish.com that contain the word.
• With the link to Google Translate you can verify the word.
• And on the Google Translate page, press the and practice your pronunciation.