Re: Greetings roleplayers!
Welcome, and happy birthday! =)
You'll find all the systems you mentioned here. The most popular games tend to be D&D and freeform, but there's a lot of interest here in Numenora, and Shadowrun, OWoD, and NWoD all have contingencies of fans here.
If you don't find what you're looking for in Wanted - Players, you can browse the current games on the main page or post as ad in Wanted - GMs describing the specific game you're looking for.
Good luck, and have fun. =)