"To have a bestfriend in your face the whole time and not know it.
To have a bestfriend who care and not afaid to show it."

"Bestfriend" should be "Best friend".

Third line: "care" should be plural and "afaid" should be "afraid".

"A bestfriend who's there for you.
When you have a problem they'll help you through."

So true, best friends really help you get through the rough places of life.

"The good times and bad times
Through think and thin.
A bestfriend is there with you till the very end."

Well-expressed emotions, nice wording here.

"That's why I love my bestfriend.
We may argue but never fight
That's why she's my bestfriend 4 life."

"4" should be spelled out to "for", just proper grammar. 4/5 from me, a cute friendship poem about the joys of having a best friend. Keep writing...