* Correction:     Student's sentence        Corrected sentence        Grammar explanation       Better sentence    

My favorite activity is meeting with my friends. Because when I finshed work, I’m so tired and I need to heal.

My favorite activity is meeting with my friends because when I finished work, I’m so tired and I need to heal.

Avoid starting your sentence with "because". The reason you can’t usually start a sentence with “because” is because the sentence needs two parts for because to join together. Usually, “because” goes in between the two clauses, so if we start a sentence with “because” there is often only one clause in the sentence.
Be careful with your spelling - F-I-N-I-S-H-E-D. 

So When I meet my friends, I feel better.

So when I meet my friends, I feel better. 

This sentence is correct, but the first letter of when shouldn't be capitalized. 

I feel better when I meet with my friends. 

I usually meet my friend after work and eat a delicious food or drinking.

I usually meet my friend after work and eat a delicious food or drink.

Sometimes I go to a drive. I really love it.

I sometimes go driving. I really love it. 

Avoid starting your sentence with 'sometimes' in an academic writing, although there's nothing wrong with it when it comes to informal verbal and witting communication/language.