I have no idea when it's appropriate to interject in a conversation

[neurosis]

It's especially bad in group conversations because I always seem to randomly interrupt people by making a completely false judgement as to when they're finished speaking - The normie then registers this 'attempt' at interruption as a power play, so to reassert dominance they blatantly ignore me and carry on speaking, over me, which makes me come across as extremely submissive.