guilt, fear and volunteering

Somehow I've gotten myself in the position that I am the team parent for my daughter's softball team. Okay, I know how I got myself into this position. It's because I feel guilty all the time for not being able to do all the stuff that other parents do and they needed a team parent and no one was volunteering and...... Here we are. Most of it is just online stuff sending out messages to all the parents, keeping everything organized, streaming the games on the app on game days. So, so far I'm fine. 

It actually makes me wish I could do things like this more often, but it also makes me realize that unless things are within specific parameters, like everything being online that I can do from my phone while I'm in bed, I can't commit to it. I'm currently sitting here staring at a sign up genius page for my son's Country Fair at school trying to figure out how I'm going to feel on Friday at a specific time to see if I will be able to volunteer. And if you're thinking "well, how are you possibly supposed to know how you're feeling on Friday?" That is exactly the point. I want to volunteer, I want to help at his school, I really actually enjoy helping at their schools and for their sports teams, but when I have to plan in advance and commit to something, it's terrifying for me. I'm not complaining right now, so much as just saying that it's unnecessarily scary to be asked to commit to something in the future. And I don't think that that's necessarily something people think about in terms of chronic illness. People are very understanding with me about things I can't do in the present moment, or things that I just know I cant do now or in the future, but when I say things like I don't know, or I have to tell you that day, then they don't quite get it. They try, I'm not complaining at all about any of my friends or any of my children's organizations because everyone has been just unbelievably helpful and caring when I tell them my circumstances, but the fear of letting people down is my point here. I think. I'm never really sure what my point is, but today I think it is the fear of letting people down. I have this tremendous guilt of not being able to do these things, but I also have this tremendous fear of committing to things and letting people down. Which is worse? Can I have secret option 3?