I don’t believe you meet anyone by accident. They're all a lesson. How to love or how to forgive. They all have a purpose.. so when you part ways, take what they've taught you and use that towards others. Let it make you better, not bitter.
Your parents may be strict and over controlling but sit back and look at the kids that have parents that let them do whatever they want. What are they doing? They partying while you doing an essay right? Yeah it sucks but one of these groups will succeed, take a guess.