How to Start doing things Alone?

One of my biggest pet peeves at late testers and untimely people. Because of those, it makes me no longer wanting to go with people and I sometimes go out, get food, and chill in the parking lot.

I wanna go out, do activities like playing golf, bowling, having picnics, etc. but my friends take forever to make decisions and we end up having no time (plus it wastes my time).

My schedule is more flexible than them because I own my businesses and work on my laptop. I understand their busy schedules and lives too, but I wanna be able to go with them. My cousins live far and are under 18 which is also sad. I don’t have any other friend groups.

How can I be more confident and comfortable to go out in public to do things? Like eat at restaurants, or play at Topgolf alone. Not worry about others.