What gender would Identify in if I feel like a girl some time, but other i feel like a boy, neither, and both at the same time?

It sounds like you are genderfluid: your identity varies from male to female to agender or non-binary to bigender, making you a genderfluid person.

Gender fluid or gender queer. You identify as everything but nothing which would make you that. But you’re perfect the way you are and don’t need any labels

That would probably mean that you are genderfluid, according to the definition, but don't feel like you have to label yourself. If you want to then that's fine, but if you don't, that's totally cool too. Just be you and explore different labels, and you might find one that you feel fits you. If you don't, that's perfectly okay, though. Personally, it took me forever to make myself explore my gender, and I wish that I would've done it sooner. Just be who you are, and you do not have to rush to find yourself a label. If you wanna label yourself, go ahead, but don't feel like you have to.

Gender exists on a spectrum with male and female being the two extremes of it, in between which there are all these other possibilities of gender expression. What you are describing to me sounds like gender-fruid, non-binary. And its definitely something I relate to, feeling sort of part-time with each gender, but not really fully belonging to either fully. I'm wondering, if you are expressing the fluidity with different clothes or using different pronouns? And what pronouns do you use? Also, if you have to deal with dysphoria at times? Just curious cos its something I very much relate to