As a married person, for coming up to 30 years ( next year), I can tell you, that what appears to be happy families, is actually quite the opposite.
I have a single friend, who feels pretty much as you do. She is 54 now and still single, however, she is coming to see that marriage is HARD WORK. It is not about being in love and all smiles and hugs and kisses. It is about living life together and that is not easy at all. If you succeed in finding a partner on a similar wave length and who is a good listener and understands your person dynamics, then it can make that hard work, bearable.
We always want what is not in our sight and I know so, because I have always wanted children, but due to male infertility, I cannot experience that and for years and even now, I cannot bear to see pregnant ones and it seems every woman is pregnant, but when I asked someone else if they have noticed the influx of pregnant women, the answer is no, because they are not in that need. Whereas the single sister feels every one she sees is married, but in fact, many are not married.
Marriage also does not mean fullproof that you are never going to be alone. It is said that marriage means every day the loved up couple see each other, but in reality, due to normal living ie work and keeping the home clean and if there are children, looking after them. Looking after animals. All that takes the place of romance and so, couples have to make an effort to love each other.
My single friend said that she longs to be hugged, but has come to see that perhaps if she lived with a man who is not into that or demanding, those hugs could become obhorient.
Sorry, for being realistic about it, but having lived it, I cannot help but say how it is.