Panic about life, marriage and happiness.......? Over 21's need only answer?

I am 26 years old. I am feeling like all of my friends around me are all getting married and I may be one of those people that never does. My dad also recently said that I should have a long term girlfriend and should be moving to getting married soon, which I was quite pissed off about. The thing is I moved back to England to be with someone who ended up cheating on me. I feel like I am starting to panic about finding a person that I want to settle down with as I want to have kids and a wife (sick of going out and acting like a drunken moron on the weekends to be honest). Should I be panicing - I am single and have been since March but had a bit of a fling in July but nothing too serious as she was moving away. I just seem to not really want to talk to random bar girls and my friend circle seems to be shrinking and I am meeting less people-which is making me panic. So should I be all stressed that i am sort of at a crossroads in my life or just chill. Input needed!