How can I confirm if I'm autistic or not?

Without knowing more to potentially rule out any other potential diagnosis/disorders, I would have to say that a behavioral Analyst would be most appropriate in determining whether you have autism or not. Autism is a spectrum, and cases within the spectrum can run from mild to severe. There are also many forms of Autism along the spectrum. A Behavioral Analyst specializes in Autism, and could determine where, if anywhere, you would fall on the spectrum. There are many symptoms that correlate between many disorders, such as the trouble forming relationships that you mentioned. You would need to locate a Behavioral Analyst in your area, schedule a date for an appointment, and discuss the possibility of an Autism diagnosis. They would then proceed to determine if a diagnosis would be appropriate in your case or not. They are also equipped to determine if it may be another disorder instead of Autism. If it is Autism, they will then be equipped to provide any counseling or other alternative help to you to aid in success. They can work with you on how to form new relationships, how to keep relationships, and how to process emotions. I would highly encourage you to seek a Behavioral Analyst soon if you would like to proceed, because they tend to book several weeks to months out. Some areas have limited Behavioral Analyst in the area, and therefore, they are widely sought out. Many counselors do not have as much training with Autism as a Behavioral Analyst does. Some counselors are very versed in the topic of Autism, so if there is a counselor in your area that specializes in Autism, then they too may be an appropriate resource for a proper diagnosis. Some medical doctors are also versed in Autism, and could provide a proper diagnosis. Hopefully, between the three resources listed above, you will be able to find you a provider in your area that could provide more insight into this potential disorder for you. The local public schools in your area may also have a listing of those in your area that focus on Autism as well in case you can't find any resources on your own.