I think I may be autistic

I'm a 25 year old guy and I've always felt different. In primary school, I didn't have many friends and was bullied by my peers. Most of the kids my age were into football, superheroes and similar things. Whereas, I got excited about trains and planes. I always struggled with academic classes such as English and excelled in drama and hospitality. 

I was told you couldn't be autistic without having dyslexia. My reading isn't too bad but I tend to fail at understanding what I'm reading without someone else telling me what it means. As for maths, I feel like I know the basics and have adapted little tricks to help me work quicker. 

When I was 18, I was diagnosed with anxiety, but I have always felt this is only in social situations. In secondary school, I'd feel uncomfortable when people I didn't know would speak to someone in my small friend group and would often walk away and wait a little away and wait. 

I've always found making friends hard and most of the friends I've made have been the ones to initiate conversation and invited me to hang with them. In college, I was pretty much on my own for the first month or two, and felt like an outsider. It slightly upset me because I didn't know how to make friends and be 'one of the cool kids'. Although, it was fine to me to do my own thing. 

When people ask me my opinion on things, I tend to be say exactly what I think and people will say I'm just being nasty or rude, but I think it's an obvious outlook. When meeting new people I'm extremely shy and don't know how to keep the conversation going. 

I had a few teachers in school, a few friends and my sister say they think I'm autistic. I recently read a forum on here and kind of identified with it. In the replies someone told the poster to take an aq test and I decided to do one. I scored 45 and according to the interpretation, it's a strong likelihood of aspergers syndrome or autism. 

I'm not sure what I should do and don't understand it. Simply because I've always been lead to believe that autistics are aggressive and prefer to do things alone. 

Can anyone else relate?