This is an issue that a lot of people suffer with (but mostly men from my experience) and I'm sorry that you also feel this way.
If you are looking for a boost to your mood in relation to this, I believe there is a rather effective way... although it requires a serious amount of neural rewiring. So firstly - our society puts WAY too much emphasis on being in a relationship. A ridiculous amount - to the point where people define their worth off of relationship status (I once did this as well) I was heavily depressed because I could not find a partner. It was all I ever wanted - and when I eventually did get into a relationship, it was nice..... for the first couple of months - but then it turned into an absolute train wreck. I was going into this relationship expecting that this person would "complete" me, and when I still felt depressed and lonely despite having a partner, things very quickly went downhill.
I am a strong believer that human beings need love to survive - but it does not really matter where this love comes from. I think the issue here is how many will view different types of love as being "better" or "worse" than others. (for example, love from family and friends being "lesser" in comparison to love from a partner) Treating all types of love as equally effective and nourishing in your life is a really positive and effective way to feel better. My life is not happy by any stretch, but I do not spend every night feeling depressed about this anymore - I am happy to be single, because I do not feel like I am "missing out".
I'm sorry if this post feels patronising in any way, it is not my intention. I just know that I felt a lot better about this situation in general when I decided to not believe that a partner could complete me or fix my issues.