If you feel uncomfortable when giving feedback (especially negative), it is the result of your ‘internal connections’, your self-talk. Treat this as an opportunity to examine the filters/beliefs that you hold around giving feedback, for example, ‘I might make them angry’ – forgetting that it is their choice whether or not they get angry and your responsibility to act appropriately.
It may be useful to re-consider your underlying purpose in giving the feedback and for whose benefit it is being given? Is it to assist or to ‘have a dig’? Is the feedback wanted?