Do I have a right to be upset?

My family talks my fiancee more than they talk to me, my sister talked to me almost 2 weeks ago but doesn't have a problem talking to my fiancee. in fact they made plans for his birthday without me. I always feel excluded because I'm always last one to find shit out it's been like that since I made the mistake of my ex, whom I thank everyday for my two kids without him I wouldn't have these precious babies, please no rude comments (I'm stressed about college and emotional)