I worked in Further education with young and mature social care students, and later in Higher education counselling trainings.
I think it may be worth trying a positive attitude to how others will be on your return, rather than predicting that they won't accept you, as if you predict this, it may be how you interpret things. Whereas if you predict eventual success in getting along with colleagues, that's more likely to help you take steps in interactions and be positive even when people have trouble understanding you.
It really is completely typical that autism is not widely understood at all in workplaces, so as this is your first workplace you may be thinking this is just happening there, but as yet, how we are and our differences are definitely not well understood, and you can't unfortunately find that in the vast majority of workplaces.
This leaves us to manage as best we can, sometimes to be an educator of others, or to cope with the relative invisibility of our difference. If this is unacceptable to you, it could be that longer term you could look at self employed options, but I would highly recommend making strong efforts to succeed in fitting in at this stage, in order to gain experience and credentials at work.
Try thinking of your colleagues as a herd of deer, they shy from you and see you are different, they are uncertain and do not feel they can approach, when they make their amusing deer remarks you do not respond, it seems you do not care much for deer. They retreat and eat some acorns together making steam with their breath in the frosty air.
Ah here another approaches, Are you feeling better? He asks with a smile. No, not at all, I feel stressed and unwelcome you think. He looms over your desk as if he is trying to grab some leaves from a tempting branch. Thanks, it's good to be back! You say, and try to smile. He nods and you can't think of anything else to say. He wanders away. This happens all week, members of the deer herd wander up, or ask you how you are, are you feeling OK?
Gradually they see you seem better, you are a quiet one they think. After you feel a bit settled, a week or 2 later, you bring biscuits cakes or sweets or fruit for all, and put them in the rest room, adding a note, I am glad to be back, thanks everyone for welcoming me, I am a quiet person but I really appreciate your acceptance of me. Or something like that...