A widowed friend of mine was determined to find a new partner and after meeting many unsuitable men online she finally found the right one and they have been happily living together for a few years now. I was widowed 30 years ago, in my thirties, and had a wonderful husband. I always thought I would meet someone else as I was so young, but I'm still single and quite content now. I had one serious relationship with someone who turned out to be a narcissist and broke my heart and I just thought never again. I miss being able to do the spontaneous things that happen when you're in a couple, and get frustrated that as a single you're often not invited to 'couply' things, but the positives of being on my own far outway the negatives now. I think if you are determined to meet someone, and make it your mission, you will be successful. I have tried internet dating in the past but found it quite daunting. It's such a shame that dating has become so difficult, I know that young people struggle too.
Good luck - hope you find someone who adds something special to your life.