Is it normal i have a tooth growing back in and a tooth falling out..?

Yes.

You see, back in 1995, Monsanto started putting shark DNA into human babies, to see if that would stop the problem of toothlessness. The experiment was ongoing until about 2001, so you just may be in one of the last groups. If you are, then you're totally fine.

yes, it's a whole part in growing up from your adolescence. you are becoming a big boy/girl/whatever

Are you just talking about losing your teeth as normal younguns do or like are you a genetic abnormality or something?