Why are they all looking at me?

Perhaps they are but I doubt this. Most of the time people are busy with themselves and in their head thinking about their own life and problems

Are you sure they are? My dad once told me something, and it's stuck with me ever since. No one is watching you. No one cares what you do, except the people closest to you. If you do something embarrassing, or say something weird, chances are that the strangers that saw it will forget within 10 minutes, and the people that know you will forget within 20. No one is looking at you in public, they have no reason to be. Often, even if someone's eyes are fixed on you, they're not actually watching you. Think about how you look when you're daydreaming. Staring straight forward, eyes on an unsuspecting person. Your friends won't remember if you do something embarrassing. The public doesn't know that you walked by them in an outfit you deem horrible. They aren't looking at you, unless you want them to be.