I believe mine was Rangers Ballpark in Arlington (now known as Globe Life Park). I'm looking forward to going to the Rangers' new stadium, Globe Life Field, when the season starts eventually!
I have no doubt that my first college baseball stadium was Olsen Field in College Station, but I just don't remember when! It could've been before I went to A&M, but if not, it was definitely while I was in school a few years ago.
It's a nice ballpark that sits about 8,000. Unique features are a home run porch that overlooks left field, and the clubhouse sits just above left field, under the home run porch. The players enter the field by stairs which makes it an easier park to get autographs at then most considering the players have to pass right by on their way to the field. It also hosts the UIL state baseball championships and Round Rock Classic, a four team college classic that started this year. They have really good attendance and are set to host the 2021 AAA All-star game
Dell Diamond, home of the Triple-A Round Rock Express, now AAA affiliate of the Houston Astros
College: Olsen Field
Pro: The Coliseum