For comparison sake I'll mention this.
In January I was approached about coaching my 11 year old sons little league team. They had too many kids and not enough coaches. My first thought was no way, it'll take up all my evenings, I'll have to schedule practices, coordinate with an assistant I dont know, interact with parents etc etc.....
I said yes. Why? The biggest reason besides feeling like I'd be letting my son down if I said no.....was because I knew I'd obsess over it, I'd regret NOT doing it....because I knew I was able to. If I said no, I knew it was me just not wanting the responsibility and that would eat me up.
Don't regret not doing this for yourself.