First, if you HAVE been bullied and a victim, then you definitely need to “act tougher”. Otherwise you’re in for a long four years. My suggestion to you would be to join a martial arts program. Now, this is NOT so you can beat people up, etc. But it does give you the self-confidence that you need. Believe it or not, the knowledge that you CAN take care of yourself is often all you need. People will sense that and pretty much leave you alone. But be sure you go into it for the right reasons .. not to become a bully yourself!

If you just wish to be more grown up so people don’t treat you like a little kid and they are just nicer, there is already a lot of good advice up here. Be kind and considerate to others. Offer to help them when they need it. Pay attention and be respectful to your teachers (even if you don’t like them). In other words, set a good example for others.

Tough isn’t the answer, confidence is. Be pleasant to everyone, don’t gossip, and keep good posture. No one will have a reason to mess with you.