It has just started warming up so I figured I would go outside and plant some flowers and get a tan. I wore sunscreen and a hat, I still burnt. I also got little red bumps all over, they went away about 3 hours after being in the sun. My aunty is "allergic" to the sun, and this is what happens to her. Should I go to the doctor and ask about it?
Ive added pictures so you can get a better understanding.

One is of my leg, and one is a cluster of blister like bumps that were on my wrist and arm (there circled)

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This is your skins way of showing you what the damaging rays are doing to you. Sun exposure has a cumulative damage (the skin remembers) and repeat exposure can cause the rashes to get worse over time. With too much sun exposure you can develop skin cancer. Ask your doctor for a better explanation.

It's best to do your gardening when the garden plot is in the shade to avoid the sun rashes and burns.