Salam alaikum,
I understand how you feel. I feel this way too sometimes, but I want to assure you that marriage isn't everything. Yes, we all desire to get married and become happy, but it is not the answer to happiness and I realise this more and more with time.
You find spouses being happy with kids and they seem to have a fulfilling life, but you don't see the bigger picture. Not just with marriage but with everything else.
Just make dua, and put your trust in Allah, for surely He will give you better. I had a cousin in her late twenties who just wanted to get married and waited for a long time. Eventually she got married to an amazing husband who treats her like a queen and now has a beautiful daughter.
Continue to be patient. I ask Allah to make it easy for you sister.
fee amanillah