Really need some advice.

I am 20 years old and have been with my boyfriend for 4 years now and something came up in our relationship. I just wanted someone to talk to and vent to. I use to have a lot of friends but I focused on school and they chose to party so we parted ways. I feel so alone and I don't have any sisters to talk to:/.  I am new on this app and I wanted to privately chat about this but I do not know how. Thank you for taking the time to read this.