What does it mean when you're demi? I never fully understood.

Demisexual is a sexual identity that means that one is not attracted to another unless they like their personality. So a person is attracted to certain personalities rather than physical attraction.

Demisexuals and Demiromantics (if I'm missing others I'm sorry) do not experience sexual or romantic attraction until a strong bond has been created, respectively.

When you're demisexual, it means that you only get sexually attracted to people with whom you've formed a strong emotional connection. When you're demiromantic, it means that you can fall in love only with such people.

Demisexual/Demiromantic is when you only feel those feelings after a very deep bond has been formed. It means that you can't look at someone you dont know and feel romance or sexual attraction until you know them and know them on another level. (this is very vague and everyone's demi preferences are different.)

To be honest, in the first place, why is there even labels? Can we just characterize ourselves as human beings that has vast differences?

Being demi means you're only attracted to people that you already have bond with, so no immediate lightning bolt attraction. Even then, an attraction doesn't necessarily have to form.

Demisexuality is when you don't have any sexual attraction unless you form an emotional connection with someone.

If you are demisexual, then you do not experience sexual attraction to anyone unless a strong emotional bond has been formed. If you are demiromantic, then you do not experience romantic attraction to anyone unless a strong emotional bond has been formed.

When someone is demiromanic, it means someone has to establish a deep emotional bond with someone before they even experience romantic attraction at all. Demisexual means the same thing, but with sexual attraction.

It means that you only experience sexual attraction after forming a deep emotional bond with one person

It means that you only feel sexual attraction once you've formed an emotional bond to a person. For someone who is demi, an emotional bond has to be formed, before any kind of sexual attraction can occur. That doesn't mean it will definitely occur, just like people who aren't demi aren't attracted to every one they meet, but an emotional connection is a requirement.

Demi can apply to a lot of things. It normally means you are partially something or inbetween two things. Personally i am a part of the demigender group (demiflux) and the demisexual group. Demigender means you are partly one gender and partly another. One tends to be stronger then the other. Demiflux means part of your gender stays the same while another part fluctuates in intensity. Demisexual means you dont tend to experiance attraction to someone till you know their personality. Its kinda inbetween sexual and asexual. If someone says they are demi it really depends on whether they are talking about their gender, romantic attraction or sexual attraction etc.

Being demisexual means having sexual desires only about people you have feelings for. For demi people, there is no sexual attraction without romantic attraction. Of course, demi people can be attracted to the same gender, or the other, or both... But the constant factor is that sexual attraction is only there when romantic feelings are there.