Do consider yourself autistic even though you have never been diagnosed?

When your therapist gives you an autism diagnosis instead of chill guy syndrome:

Studying with mental illness (diagnosed) is so hard. Especially because I was very often that person who could start studying literally hours before the exam and still ace it (the real reason is because the content wasn't challenging or interesting enough to study beforehand, so i used to get involved in extra curriculars that gave me that high and neglect studying)