Why do people misinterprete the Quran by saying you can't have sex outside marriage?

they forbid almost everything that feels good and they reduce you strictly, and there to lazy to see what's truly at stake and what the Quran is truly saying so they can act accordingly and discover the logic behind what it's telling you to do. There is know where that says in the Quran from what I know of that states that your not allowed to have a sex partner or a girlfriend excluding marriage completely. I'm new to the religion, life is not meant to be lived in fear, Allah didn't give us sexual pleasure and mix man and woman for the sake of living in fear and restraining what it has given us, all it asks is that we control everything that we do. Islam encourages fun and exploration of the beauty of life, and the man is not higher than the woman like some like to think in Islam from what I'm seeing. In fact the woman is counted as the dominant being, God really is a feminist. But people continue living there lives in isolation and misery in the fear of accidentally having fun, as they see it as a sin if you ask me. They might as well say that breathing is haram too. I'm a Muslim but I follow by what God has commanded and written in the Quran and not by what people make up in their heads. When the book says women have to cover their shoulders and hair I agree with that, but I don't create a new rule for myself covering my entire body and face, God has given us a face to communicate with one another, and to form a relationship, not to cover it up