Personally, I don't see why you have to apologize. Those were your feelings at the time. You were expressing them. So many of us will come on here and post about feelings we have and most of the time, we find several people that are sympathetic to us.
You weren't directing your feelings to any one person, so I don't think it needed to be taken personally.
<font color=blue>"Our doubts are traitors and make us lose the good we oft might win by fearing to attempt" --Shakespeare</font color=blue>
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.