Buddy, here's some advice. Confidence is a lot of what it takes to get laid. If you don't feel confident fake it until you make it. The more you do it the more you'll find yourself taking on those characteristics and using them when you communicate. Wake up in the morning and look in the mirror. Tell yourself what your plan for the day is and do that. Be assertive when you talk to women. At first since you're an admitted autist you'll come off like a creep, but there are plenty of women out there and plenty of chances to get it right. You only lose if you give up and stop trying. Every chick also has a different line between creep and assertiveness that they're okay with so you'll have to learn from experience and pick up on those socials ques.
Once you start becoming more confident it's time to work on self-improvement. Start with three sets of ten push-ups a day. Add a push-up to your sets every day, and then rest on Sunday. Every Monday add five and once you hit the end of a month take a weekend to rest. Each month from then on add a new exercise to mix things up. Start mixing techniques and working your arms in other ways while still increasing your stamina. After about six months of this routine and an average half-hour to an hour workout every six days you can start hitting the gym and lifting weights/doing more extreme exercises. This is assuming you're skinny—if your fat add a 1km run everyday to that workout routine and add .5km to that run every week. If you're skinny you can still benefit from that as well.
Your diet can even remain relatively unchanged with one minor change: Protein. Eat lots and lots of protein. Eggs, meat, etc. If you're able to eat organic than do it—if you can bear protein shakes and vitamins then do those too. At the same time you'll focus on hygiene. Brush your teeth in the morning, take a 3 minute cold shower, and comb your hear. Take a hot bath/shower later in the day after your workout, brush your teeth, and you're good. Hopefully you already do most of this. The reason for a cold shower in the morning is it will help wake you up and kickstart the energy in your body. It can also help with testosterone production—speaking of which. If you can get your hand on testosterone hormone pills then go for it. The only risk is that they can shrink your dick and testies if you stop taking them, but I'm going to assume you're already unimpressive in that area. Shave when necessary and manscape as needed—it's okay to have a little bush as long as it's aesthetic. Some chicks like hairy dudes, but what they don't like is if it looks like you have crabs.
After six months of this you'll look better, feel better, and be confident enough to perhaps get laid. All you necessarily need to do from here is keep the workout and ethic up and you'll be okay—you are the average male now. If you want to keep improving yourself in a noticeable way you'll need to either invest in a gym membership or start doing more advanced home exercises. If you're broke or don't want to shill for a gym membership, I still recommend getting some weights for home use. By this point you should be able to lift at least 110lbs or 50 kg. You should start there and do 5 sets of 5 reps everyday until Sunday and take the day off. Every week add ten pounds on top of that and add a rep to your sets. Continue to do your regular exercises in tandem with these. You should also start doing more advanced and precise forms—go from general workouts like push-ups, planks, squats, etc to precise ones where you can choose a specific set of muscles you want to train. Switch things up and try not to do the same muscle each day unless you want to quickly see gains in that area—though I will warn you this will mean you're neglecting other areas and you could begin to regress.
If you do this for a year without bullshit. You will become Chad.