autistic

Hello.I am 15 years old. I have the following problems That made me doubt about Autism:
●I have a great relationship with my parents and my grandparents. They are the only people I love and trust.
●I collect robot toys since I was 5. I still think that toys are real characters; I give them names (like Andrew, Raphael...) I still buy shampoo to my robots, talk all the time to them, give them special towels... I even take them to school. I sleep with my favourite robot too.
●I have no friends. I failed to have ones. People do not understand me at all.
●I arrange stuff a way that suits me or according to my memories.
●I can easily imagine portraits and create fluent stories. I have authored 8 books.
●I do not understand what others think or intend to easily, even when reading books.
●I have difficulties with comprehension.
●I often express myself with my own words; I create new terms, words, etc.
●I love computer Science and I can not imagine myself being someone else rather than software developer. I love my computer a lot.
●I do enjoy pretending and acting as one of my designed characters with my online friends.
●I concentrate on things that others do not notice either like sounds and small details.
●I scratch myself when someone stares at me or when I go in publics.
●I experience daily meltdowns at school: I fall on the ground and cry hard when I don't feel comfortable or even normally. Classmates consider it drama but it is real.
●I hate young music. I love listening to Mozart, Beethoven and Demis Roussos. And I concentrate on instrumental parts and background music.
●When I go to social events, or weddings, I feel terrified and have meltdowns immediately.
●I have meltdowns when I am exposed to loud music or loud sounds.
●I enjoy planting trees and plants and feel bad if they get cut or die.
●I do not enjoy social chit chats
●I prefer to do things alone, and get bothered when teachers oblige me to work in group. I do not feel well.
●I can not lie. I always tell the truth as it is.
●I feel like others but it does not show up on me.
●I am obsessed with programming and creating websites the way I feel sad when I do not do it.
●I keep repeating the same things over and over. I stick to topics and keep turning around it constantly.
●I get dressed like boys.
●I barely understand the films so I do not watch TV at all, except the German news.
●I know the details completely of a specific term.
●The only two others who are not family members who understand me are two teachers.
●I make patterns of everything I see.
●I am the last to understand a joke.
●I act so spontaneously anywhere, everywhere.
●I like to stay alone to concentrate on planning my routines. And when they get ruined, I get bothered.
●I can concentrate on things that others do not like.
●I scratch myself constantly when uncomfortable.
●I am not respected or tolerated by my peers.
●I prefer to talk English and German when I am alone or when I am with my toys. I sound disabled with local language.
●I am very sensitive. All of my previous friends left me because I had nothing in common with them.
●I can not trust anyone. I prefer to work on my own.
●I always set plans.
●I totally have a different secretive style of life.

... so, am I autistic?