Is it normal that i think all couples are selfish?

Not normal. It's not their responsibility or their fault that you're single.

It seems as if you're directing the anger and hatred from your own problems at other people. You're making it sound like they're making a fucked up decision for being happy. No, that's not right at all! The world doesn't revolve around you. Obviously, you're jealous and probably using some type of defense mechanism here, but wake the fuck up and see reality! YOU have problems, not them. Your life won't change until you realize this.

Maybe all the attractive people should slice their pretty faces up to help give the envious people a break. Maybe the happy and joyful people should walk around in sack cloths and ashes. Feeling lonely myself sometimes, I like to see couples and families together. It helps me to think about how beautiful life can be and reminds me of what is important in life. When my spouse and family is with me, I hold on to my husband's arm, or all three of us hold hands with our child in the middle. This is when we are most happy. Envy exerts energy. Use that energy to better yourself and take up some new hobbies. Grow some balls and talk to a pretty girl at the book store. The men who get families are the men with a good pair. It is natural selection. Also, there is a woman for every type of man. Maybe the girl right for you is right under your nose, but you've barely noticed because she doesn't look like a model, or is of the "wrong" race, family, religion or whatever. Focus your energy on getting what you want, not on other people who were resourceful enough to get what they have.

This sounds like the same old fucked up political corectness logic.

They don't need to be obligated to let a total strangers feelings be a part of their relationship.

How could you possibly know what they think about anything?

And even beyond that I'm in a threesome at least every other week because my paramour and I invite other women to join us. Us taking more women out of your "dating" pool probably pisses you off as well, but guess what... your happiness in your problem, no body else is responsible for whether you live your life lonely or not. There are millions of ways you can meet, date, make out, fuck, or whatever you want as a single person. You sound like the kind of person that goes to a party, sits in the corner not making any effort and then going home bitter because no one came over to you.

So what would you do if you had someone? Avoid them so you don't offend anyone?

you're just jealous.