im underage and poly, i never dated before but im way more comfy with the idea of poly (principally 3date). Im actually bi/pan sexual but if i ever found a partner i dont want this to be problematic, but is very complicated. Help?

Why are you concerned that being bi or pan would be problematic for people you want to date? It is totally possible to be bi or pan and polyamorous! Being a person in the world with feelings and relationships is complicated - who you are doesn’t add any unsurmountable new complications. 

You’re young, and you already know a lot about who you are and what you want, which is a great foundation. Think about what kind of “complications” you are worried about in the future, and work on developing the skills, tools, and vocabulary to help you navigate those situations in a healthy way. All you can do is be your best self. Complications will arise for everyone, no matter who they are, and all you can do is respond to them with strength, grace, and honesty.