I'm 20 years old and I'm only 5'4. How do I know if I'm a late bloomer?

Alright, I looked up info on how to know if your a late bloomer and some of it really matched up to me. I hate being this short. I try not to measure myself to others a lot and also try not to look in the mirror and always look at my height. I feel like the stress is holding me back. Lately I have been thinking positive about it and doing these stretches for the spine and it seems like I've grew a little bit. My dad is 5'7 and my mom is 5'4. My brother is 5'9. The doctor told my parents that I would grow up to be 5'7. That's fine with me but I really want to know if this is going to happen. Maybe a lot of things will jump at me later and surprise me! I also hear that some men grow till thier like 22 or 23 sometimes. Could that be me? Maybe if I just stop thinking about it. I really hope lol. Can you guys give me some word of advice please, thanks.