Is it normal for me to think transsexuals are mentally ill?

I agree with this 100%. I think that while these people completely believe that they are the wrong gender, those such beliefs are caused by mental illness which should be addressed. Just because someone is completely convinced they’re transgender and this is who they are, doesn’t mean they’re not mentally ill.

Yeah, very right, your post, I feel the same way. Instead of going to the operation theatre they should probably consult a psychologist.

I know some transpeople and I can´t make up my mind about it either.

BUT

They are either mentally ill or legitimate.
But if they get happier being called their prefered pronuns and go through surgery, why the fuck not?

It´s none of my business.

But I Think that a lot of these Girls (they are usually Girls) with exess flab , short hair and unshaven armbits just don´t feel like they fit into the stereotype of the girly girl so they Think they are either boys or some genderfluid shit.

this is uncontroversial. trans people are mentally ill, by defintion, since tey suffer from gender dysphoria.

the definition of mental illness is a condition of behaviour that causes distress and affects how they function. gender dysphoria kind of fits this.

Transgendering to me is almost like Frankenstein's monster. It's a created gender with the help of surgery and hormones.

You are who you are born as. There is gay and lesbians as alternatives.

Yes, they are. It’s an actual condition referred to as gender dysphoria. I suffered from it at a young age. Hormone pills are the usual treatment, and they work. :)

You kind of contradict yourself.
-"If we would spend more time exploring ourselves as individuals and less time placing ourselves into cubicles..."
Isn't that what transsexuals are doing, braking out of a cubicle where others want to place them?

-"these people just expect the world to sort of revolve around them, expecting everyone to adjust to their emotions".
Does this sound familiar? Everyone has to conform to your expectations?

Personally I don't spend much time worrying about the subject. If someone wants to change sexes why should I be concerned?

TL;DR but yeah, transitioning is just another form of body modification, people can do whatever they want with themselves

Don't be transphobic. I'm transgender and I am not mentally ill. I have had mental illnesses, but that was pre-transition and also partly because I was so upset because I was born in the wrong body. Now that I'm transitioning, I feel so much more comfortable and accepting of life.
You clearly don't understand transgender people at all. Gender identity and mental health are two different things. Sure, sometimes they coincide, such as when someone who is transgender suffers from gender dysphoria or anxiety/depression around their body image, but they are not synonymous and you can't put all trans people in the same boat and assume that transgender people are mentally ill. That's like saying "all black people are from Africa" or "veganism is an illness" just because vegans don't eat meat like their human omnivore bodies are designed to.
Sure, biologically we are born to be either a female or a male, but it's actually in the process of being proved that transgender people actually have the brain of the opposite sex e.g. a biological female who is transgender will have a female body and a male brain, and therefore as they grow up, they realise that their body doesn't match their thoughts and who they are inside.