Your FOMO concern is actually legit right now. It's hard for outsiders to understand exactly how much opportunity and seniority growth is available right now. You can make several decades worth of progress in just a few years. Money, schedule, vacation... seniority plays a huge role in all of it.

Get a 1C medical. That's a no brainer if you're young and healthy and have no history of mental health, neurological, or metabolic issues (old football injuries and the like won't matter for the FAA).

I would start flight training at a local school for a private pilot cert asap... you need to get that or at the very least solo in order to assess whether you really like aviation or not.

If you decide to do it, if at all humanly possible try to work on ratings while attending college so as to maximize progress towards a seniority number.

Almost hate to say this but I'm going to... I would normally never suggest skipping college, but at this precise point in time it might actually make sense to get on with flight training and get a regional job first, and then chip away at the degree via distance learning. You'll have time to make good progress once at a regional. If you're motivated and disciplined you could likely get hired at a major several years sooner than if you finish the degree and then do flight training. Might even get hired before you finish the degree, but I wouldn't plan on that.