My father's selfishness

I think a long time ago that my father is selfish. Yes, he is. I think that all fathers are selfish and cold.

I hate my father

Dear Lord, this is so selfpitying. Just remember, if it werent for your father you wouldnt be alive. 

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My father's selfishness

I think thought a long time ago [If the thinking happened a long time ago, then use past tense "thought" instead of present tense "think."] that my father is selfishness. Yes, [so is][unclear]. I think that all fathers are egoist egotistical and cold.

I hate my father.

Notes

1. "I thought a long time ago that..." When you say it this way, it is clear what you thought of your father then, in the past, but it is not clear what you think now, in the present. If you want to emphasize that you still think he's selfish, you might say, "A long time ago, I realized that..." This would show a thought that started in the past and continues to the present.

2. "...all fathers are egoist and cold." "Cold" is an adjective, but "egoist" is a noun. If we are modifying the word "fathers," then we want both to be the same: either both adjectives or both nouns. In this sentence, it is easier to make them both adjectives; all we have to do is change "egoist" to "egotistical," an adjective with similar meaning.