So, walking around campus, I've noticed people usually have a serious or confused look when walking around - very focused on the path ahead and never really loooking around. This peaked my interest a bit.

The title speaks for itself. Personally, I'm trying to incorporate a more positive vibe - like i'm thinking of something funny for the most part and randomly give a smile to girls walking by. Though, usually, I'm just like that- serious and walking with a mission. Again, i'm not psychotically smiling like a freak but moreso casually.

When you're walking around, gaming or not, how exactly are you presenting yourself?

When you walk, be the HNIC. Your chin must stay up, and a slight smile is the way to go, like you just keep thinking of or remembering funny shit in your head. NEVER LOOK DOWN. Keep your eye level with the horizon. Shoulders back like you're trying to squeeze your blades together (not like a fruit loop, do what's comfortable) and confident strides. Posture is everything.

_________________
Only one thing could cure this: Dance Music.

Recently I've been working n my posture and how i carry myself. I used to walk around looking at the ground but not i always keep my chin up and my shoulders wide and not hunched. I did accidently trip once because of it but the way people talk to me seems different ever since i've been trying to show more alpha characteristics.

stroll at your own pace, in a relaxed and calm fashion - remember it's the world according to you so dont let social pressure dictate any different. Also have a minor smile/chilled look like a guy that knows that everything is gonna go right that day and stare at every mofo you walk past if they look at you then look down - carry on, if they maintain eye contact :

If it's a guy give them a curt nod of acknowledgment as to an equal
If it's a girl give them a big smile and say hi

I don't fully understand what you mean by this. Are you saying when they look at you that you should look down? Or if they maintain eye contact, you should maintain eye contact?

I walk with a good posture and with my chin up, but whenever passers by look at me, I suddenly feel anxious and look away naturally.