No one will laugh at you! The main point of a competetion is to have fun and meet new cubers. You are absolutely right about it being a cool experience. Competitions are extremely fun even if you aren't very fast, I've been looking forwards to this one for so long.. Having a WCA profile is pretty cool too..
I'm sure no one would mind if you entered, and it's a great thing to not care if you get last. Maybe you will get last, but there will be a lot of slower people and I wouldn't be surprised if you didn't come last. A lot of people don't come to a competition just because they're scared of getting last or scared of getting laughed at, but I've found the cubing community is always very friendly and accepting at competitions. I hope to see you there!
I'm sure no one would mind if you entered, and it's a great thing to not care if you get last. Maybe you will get last, but there will be a lot of slower people and I wouldn't be surprised if you didn't come last. A lot of people don't come to a competition just because they're scared of getting last or scared of getting laughed at, but I've found the cubing community is always very friendly and accepting at competitions. I hope to see you there!