Steps

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   Have a great personality. Be kind and thoughtful. Have fun and be happy! Don't talk to much about yourself, arrogant is ugly. Be a gentle man.
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   Take care of yourself. Looks are very important. Sure, it's true that beauty comes from within, but from across the room no-one's gonna know anything about how 'beautiful' your soul is. Looking good draws people in, then you can show them your personality.
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   Start with your hair. The easiest and cutest styles are about medium length. Not to the shoulders, a tiny bit shorter. Do an image search on some guys which are considered to have 'cute' hair, for example, never shout never!, Zac Efron, etc.
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   Take good care of your skin and face. Cleanse it everyday, and try to reduce redness. Find out what irritates it. If you get acne, find the best treatments, and keep using it everyday. Don't slack in your skincare routine!
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   Clean your teeth! It might sound obvious, but keep food out of your teeth and make sure they aren't yellow. Buy some whitening strips if you need to.
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   Keep a good posture and don't slouch. Look approachable, keep your arms by your side and avoid crossing your arms over your chest unless you want to be left alone.
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   Don't think that fiddling is childish. Play around with your hair, twirl pencils, etc. It's adorable! Don't overdo it though. It might make people think you aren't interested in what they're saying if you're having a conversation.. Clicking pens, zipping and up-zipping stuff and tapping the table loudly is annoying.
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   Be slightly shy. If you're walking alone, you can look down at the ground sometimes. If someone speaks to you, speak in a soft tone and keep your voice at a decent volume. Not too loud, but not too quiet. Widen your eyes slightly.
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   Smile! Looking serious and cold is a major turn off. However, wide grins are left for only your friends, as it can look goofy if you aim it at a girl. Closed mouth smiles are adorable, and you can grin softly too. Don't be afraid to laugh! Laughing is very attractive.
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    Be a little sensitive. If you're sad or scared show it with your face and body language. Whining and crying to people is creepy, though. Only talk about it if someone asks if you're okay.
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    Be intelligent. You don't have to be top of the class, but keep your grades good.
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    Remember that dress isn't really that important; keep in shape and you can pull off anything! You can follow the trends or try your own style.
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    Keep in shape. Eat healthy and exercise regularly.
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    One of the cutest things to do (however strange it may seem) is fall asleep in class. Ask your family if you have any bad sleeping habits, such as dribbling, snoring, sleep talking or walking, etc. If not, then give it a go! Make sure the lesson you choose to fall asleep in isn't important and you are genuinely tired. Faking sleep is just attention seeking. If you can't be woken easily, this isn't for you. There's nothing worse than sleeping through the whole class. If you don't think you can carry it off, do not try it.
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    Don't talk about people in a bad way. If you have nothing nice to say then don't say anything. You may not know but the person you're talking to could be a really good friend of the person you're talking poorly about. That will just make things awkward between you, and word may reach back to the person you don't like. Also, never pick on people, or make fun of them. You'll just look a bully, and that will make people steer clear of you.