Am I being totally crap or depressive lately

So, I am going through a rough patch of my life, I want to get married with a guy with whom I am in a 3 yrs of relationship but my family is not agreeing because he is not from our caste..also I am almost 30 and somewhere my career got stuck for this. So slowly I am becoming depressive,I don't feel like doing anything and I don't enjoy anything,can't concentrate in anything. So my bestfriend is getting married next month, I am so happy for her but from last few days I am avoiding her like whenever I talk to her she starts talking about her marriage preparations and I know I should enjoy the conversation but i don't.because eventually everyone is getting settled except me!