hayatima girdiğin için mutluyum

 I am happy because you entered my life

This is my attempt.

 I wanted to ask a question, i think you are right, but ecause i want to learn, if i break it up, this si what it means inside m mind, you entered my life, because(of that, or so that ) i am happy, so how did you put it together to ake it that sentence? I am happy cause yu enterd my life? I feel like i cant join them together to make a sentnce, ow do you do it?

 First of all I think you should stop thinking in your own language and start thinking in Turkish. I know this is difficult for me it is also not easy, but you have to try.

Verb stem+TIK+pers. suffix icin means ... because ...

 if you look at the link below I hope this will help you

http://www.turkishclass.com/tl_lesson.php?lesson_id=33

verb - dik - personal suffix için means because

girmek - to enter

girdiğ-in için  = because you entered