I wish I found it easier to commit to other people

I found this volunteering organization which I got really interested about, but long term just simply commitment scares me. The organization was for a childline where I would basically be on a shift where I answer the phone if any child wants to talk to me about their worries or troubles. But what worries me is that I don't really know if I would be able to know what to say and know what to answer if a difficult topic comes up so its out of my comfort zone even tho I really wanna do it. It sounded really interesting to me but the second I started thinking about it further I just got this feeling like, do I have this kind of commitment in me?

Another organization was called 'befriend a child' where I would basically commit to hang out with a child twice a month, for 2 hours, for a year minimum. The children are mainly from not so good backgrounds and so the goal basically is to make the child smile and have a good time. When I heard about it I just thought right away YES. But now a few days later I'm like, 'For a year? What if the kid doesn't like me? What if its weird and awkward?' and all that. It's really bad to think like that tho because that few hours that I'd spent with the child could make them forget their reality for a bit and they could just have a good time and laugh. It would probably mean the world to them.

My point basically is that I really really would love to have a responsibility like this where I could feel good about what I do and feel like I'm doing something for someone else, but I feel like I don't really have it in me. Personally I think it would do me some good to step out of my comfort zone especially if its for the good of someone else, but how do I make myself do that. I keep telling myself, 'I'll do it!' and then I'm like 'Naaah' the next second. I really need someone to have a good long chat with me and persuade me to get up and go for it! I know I should go for it, but long story short 'easier said than done'. I really wish I get myself to commit to this in the next months!