It's not how "good you look", it's how "attractive" you are.
There is one thing that is very true though...
You MUST do the absolute best with what you got.
If you're an ugly guy, and also 100lbs overweight, have ****ty confidence and weakling body language, OF COURSE girls aren't going to go after you. Even if you have tight convo skills!
If you are an ug, then you should do everything in your power to do the absolute best with what you got! Go to the gym, get in TIP TOP shape. Get a six pack, get broader shoulders. Work on your image and your attitude. Learn how to communicate with non-verbal signals, and learn how to act and behave like an alpha male. Learn how to not give a ****, and learn how to show women that you are a MAN.
You can say looks matter all you want, but there is just too much evidence against your claim. Looks are a factor. Definitely. Being a "HOT MODEL HUNK" is obviously the easiest way to get laid with little to no work...however, most of us are not hot model hunks. Lucky for us, we have game. And it's been shown time and time again that looks matter MUCH MORE to men, than they do to women.
I can think of 10 PUAs offhand who are average or ugly that can get hot women faster than some of the best looking guys out there. Style, Tyler, Papa, Rick H, Steve Piccus, Gunwitch, Loverboy, Doc, Elvis Preston King, Herbal...
There are plenty plenty more.
Now, I have to ask you a question. When are you going to STOP making excuses for yourself, and get out there and change yourself?
If it makes you feels better to think that looks are really important, and that's why you're not having the success that you want, then so be it. But just know that the real problem lies in your mindset and motivation. Many, many ugly or average guys have paved the way for you. They have laid down, step by step by step exactly what you have to do to get laid, or to find a partner. There is really no new frontier you have to embark on. You simply have to take the advice and learn the lessons that the greats of yesterday learned.
It's solely your choice. At the very least I ask that you stop making excuses for yourself, and make the best out of what you've got.
GL.