too introverted

I should probably start this off by saying that I'm autistic, and it's most definitely the cause for this behavior, but I still want to rant about it and get it off my chest anyhow. 

I feel bad because of how introverted I can be. I'm not talking about being shy or being unable to make friends or anything like that- I mean introverted in the sense that I recharge my battery by being alone (and extroverted people charge their battery by being with others.) 

What sucks is my battery is so small. I only work 14-20 hours a week, in a work environment that is really chill. I'm genuine friends with all my coworkers and I love and cherish them all. Other than that, I don't leave the house. I don't leave my room. 

I have SOOO many friends, who I am very thankful to have in my life. But the problem is, I feel like I'm always trying to run away from them. Every time I turn around I'm making an excuse so I don't have to hang out. Sometimes I don't even feel like talking to someone online. When I'm not at work, I just want to be in my room and I don't want to waste a single second outside of it. 

On one hand, I wish that I could be left alone for a while. On the other hand, I'm scared that my lack of engagement over time will cause me to lose my friends. I just get so drained and tired. I would feel bad saying "hey, I'm too tired, lets hang out another time." because there wouldn't be another time. I'm always so tired.