[Sun Care] I was lying out in the sun and believe I acquired sun rash underneath my arms and on the inside of my biceps... Need advice.

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Hi reddit skin experts, I'm a 27 year old male and I live in a northern state in the US my body is pretty covered up during the colder months. I was lying out in the sun last weekend to get a tan. However, after a while (2-2 1/2 hours) I realized I was getting these red bumps on my body and they were beginning to itch. I did some research and believe this is sun rash. My body under my shirt hasn't really been exposed to sun light in the past year, and this is pretty embarrassing because I love lying out in the sun, playing at the beach, etc.The articles that I have read said that it goes away in about a week, which it has been slowly disappearing on my body. I have a couple of questions. Will I be able to be exposed to the sun without this happening eventually? If so, how long does it usually take? Will my skin adapt once it gets pretty tan and won't happen? Is there anything besides sunscreen that I can use to prevent this? Why is this just happening to me now? Any help or insight would be much appreciated.
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Submitted by throw1ta11away