I'm like Phil above, started playing (mid life crisis, bass or a motobike...music seemed safer!), answered an ad after about 3 months noodling in bedroom, band gave me 3 songs to learn,, we jammed em, I was in. 1st gig about 6 weeks later, with 4 original songs too. 10 years later I'm still learning, still loving every minute of it.
get out there and scare yerself trying, the adreneline rush is huuuuge!