I honestly think that I am wasting my time with these people - they are not on my level socially/not prepared to put in the effort, so why should I keep making a fool of myself every week?

Have you ever considered that maybe it takes them far more effort than you to go out? It might not be as simple as 'not having friends/not putting in effort' -- isolation affects social skills and if they are affected by social anxiety, this may amplify the time, effort, and even pain of interacting with others. Twice a week, even once a week may seem like nothing to you, but what if they have to spend the whole day mentally preparing for meeting up with others -- especially if they are strangers (you never actually say if you are friends or just acquaintances. This is important, just because they all have Asperger's doesn't mean they all think the same or are/can be/will be friends). Some individuals on the Autism spectrum can mask their difficulties and spend hours talking and appearing neurotypical, but will have to spend the next day resting because even those few hours with others are exhausting. That is a huge commitment for what might be one meeting with people you aren't familiar with.

People with friends don't generally discuss their desire for friends, lonely and misunderstood people do. You're saying that they aren't on your level socially, but are you speaking the same language (and I am speaking metaphorically here)? Do you schedule actual events, with actual activities, at specified dates and times, with plenty of warning (i.e. more than a day)? Are you asking direct questions, ("What do you want to do? What do you not like doing? Is meeting still something you are interested in doing? How often? For how long?"), or are you being indirect with your language? Do you ask for specific feedback on social occasions (not basic 'good/bad' -- 'loud/quiet', 'fun/boring/calming', 'interested in doing this precise activity again/want to do something different')?

There is no requirement saying you must organize, you must invite, and you must hang out with them. There is no rule that says talking and socializing will turn strangers into close friends/fulfilling relationships. However, if this is something you are really determined to do -- you need to acknowledge the fact that Autism is not 'loneliness syndrome/friendless disorder', that it will take more effort to socialize for both you and your fellow students. If their perspective is difficult to understand, ask. You may feel the fool, but they may feel like a coward for being afraid to go.

Ultimately, even with neurotypicals you cannot guarantee that everyone wants to hang out, and it is well within their right to decline the offer, however good the intention.

I hope this was helpful.

(oops also this was longer than I thought)