Can you call yourself bi if you’ve only had feelings for both genders, and never dated the opposite/same gender?

Yes of course, you can identify as anything you like without having those experiences, you know how you feel. Labels aren't always useful and how you feel is more important. I identified as BI for a while even though i had never had any physical contact with a woman.

Of course! Your identity is a reflection of how you feel and not who you have dated or will date in the future. How you feel inside is what is important, not the labels that society assigns.

Your orientation is not about your experience, it's about your feelings/attraction. It doesn't matter who you have or have not dated: if you can be attracted by men and women, you are bi!

Absolutely you can! Your experience, or lack thereof, does not diminish your feelings. Bisexuality is an attraction to more than one gender, not experience with more than one gender. If you feel like the bi label fits you, then use it!

Do you think every heterosexual person ever waited to date people of the opposite gender to know/tell/call themselves "straight" ? I don't think so ^^ You call yourself whatever feels right for you, even if you didn't experimented. Attraction is attraction, it doesn't give any clue about "actions". ^^

You can call yourself whatever you feel comfortable with, the label isn't important, it's a guide for other people to understand you a little better, if you're comfortable with the label and want others to see you as bisexual (open to relations with both sexes) go for it, if not, don't.

Sexual Orientation is a fluid concept. Bisexual/Bicurious/Lesbian/Gay/Asexual. These are just labels. Sexual orientation is not very rigid as such and it is not necessary that only after a certain number of sexual experiences would one find out their sexual orientation. Some people do at any early age, some people take an entire lifetime to figure it out. There is no straitjacket formula. If you are confused about your orientation. Talk to someone. An expert in the field. Additionally, also try to discover how strong are your feelings for people of the same gender. Are those feelings always present? Or is there infatuation with a particular person. Moreover, do not stress over it.