I have, of course read Clockwork Orange, 1984 and a couple of the others you mention but apart from 1984 I did not enjoy the experience. 1984 falls, I feel, into a different category and anyway it had to be read at school.
Just discussing this with the missus. She is heavy into historical novels, I prefer biographies & out and out history (non fiction all of it) Turns out that I read very little fiction these days so maybe that is the problem.
I am not saying it is your problem and am happy to accept that it is a fault of mine but I just cannot get into Science Fiction and life is too short to persist with something I dislike in favour of something I know I will enjoy.
As a kid I took the "Eagle" comic for a while ('cos it was a craze at my school at the time) but I can honestly say I never bothered to read the Dan Dare stuff after the first two or three issues. I much preferred "The Wizard" or "The Hotspur" until I made the joyous discovery of MAD ~ then I dropped comics and slowly graduated from Mad to Private Eye and the Daily Telegraph which is where I now sit.