It probably depends on which country you were born in. Maybe in the Netherlands 6' would be average. But not in the Philippines for example. I am English. I would estimate 5' 8" is average here.
You're not a manlet bro. You have not been gifted with the right to be a manlet. To be six foot and claim to be a manlet is narcissism and you will be seen as a false king. An invader. An imperialistic crown. A foolish giant. A Goliath (and we all know what happened to him). The hobbits, the dwarves, the davids, and the midgets will overthrow you (violently). Please leave our kingdom. This is a peaceful warning.
I am 5'5" (1.65m) and pretty sad that 2 german doctors had refused to give me any injections to grow alittle more. I was so dumb for telling them the Truth about the Height of my Parents. My Tip to People who are currently short is this: Tell those Doctors lies otherwise Women make fun of you and don't respect you because you are too short and you can't play any Sports if you want to do it seriously. You have to go to 100 Doctors to reach your goal maybe. Telling People the Truth just brought me to Suffering my whole Life. Telling the Truth never helped me in my Life to reach my Goals. You sometimes have to act evil. Wether in school, your family, your doctors your neighbours your friends or anybody else. You have to lie about everthing in Life to get what you want to get. Tell those Doctors that your Parents are tall so they have to give you that injection to become 1.80m. If thats not working go abroad in another Country for Example Turkey. There are Ways to get those Hormones even on black market. There is even a way to break your bones and to strech it. You can easily become 10cm taller. This is something what a turkish Youtuber did who was 1.65m like me and he became 1.75m with this methode. But I forgot the Name of the Therapy. If you are 5'5" you won't get a Life Partner you will end up alone. This is the Truth! Also wether we deny it or not it is not seen as manly enough to be short as a Man. Don't say to me that going to gym and having muscles is enough. This is totally bullcrap.
I think you should have more respect for yourself, because that probably shines through more than your height. Those surgeries could cause you to be reliant on canes and walkers for the rest of your life. Not worth it. They're also hella expensive.