Asperger's syndrome symptoms ?

Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by your behaviour patterns that you might have Asperger's(AS) or some other pervasive developmental disorder.
Children with Asperger disorder have a qualitative impairment in the development of reciprocal social interaction, often showing repetitive behaviors and restricted, obsessional, idiosyncratic interests. They have deficits in nonverbal and pragmatic aspects of communication (facial expressions, gestures). They do not have the severe language impairments that characterize autism. Although they are somewhat socially aware, these children appear to others to be peculiar or eccentric. They are awkward and clumsy and have unusual postures and gait. To meet the diagnostic criteria for Asperger syndrome, a child must manifest impairments in social interactions and show restrictive, repetitive patterns of behavior, interests, or achievements with other people; these disturbances must cause significant impairments in social or occupational functioning. Unlike children with autism, those diagnosed with Asperger syndrome have a history of normal language milestones, with single words used by age 2 yr and communicative phrases used by age 3 yr. There are often similar traits in family members.
A person with AS may engage in a one-sided, long-winded speech about a favorite topic, while misunderstanding or not recognizing the listener's feelings or reactions as in your case you are not able to understand the difference between seriousness and sarcasm.
There is no cognitive impairment in AS as is seen in Autism. You also seem to be doing good academically for that reason. The cognitive ability of children with AS often allows them to articulate social norms in a laboratory context, where they may be able to show a theoretical understanding of other people's emotions; however, they typically have difficulty acting on this knowledge in fluid, real-life situations.
Persons with AS use language literally but have difficulty in understanding figurative language. That may be the reason for being good in textual analysis of language but struggling to understand what people mean in conversation.
You must consult your doctor for definitive diagnosis as the same cannot be made online. The current "gold standard" in diagnosing ASDs combines clinical judgment with the Autism Diagnostic Interview-Revised (ADI-R)—a semistructured parent interview—and the Autism Diagnostic Observation Schedule (ADOS)—a conversation and play-based interview with the child or person. Group social skill training is the hallmark of intervention, although children with Asperger disorder appear to be at high risk for other psychiatric disorders, particularly oppositional-defiant disorder and mood disorders. Cognitive-behavioral therapy has been useful in patients with associated anxiety.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.