I feel like I'm likeable, but unlovable

I'm probably going to sound pathetic, but anyways.

For some context, I'm 20F. I think that physically I'm pretty average, maybe a little bit above average. I'm definitely not some type of model, but I do get quite a lot of compliments and/or attention from men.

When it comes to my personality, I'm obviously not perfect—I have my flaws—but I think I'm very aware of them and working on them, and I don't think they're anything big that would be a dealbreaker (like being a very mean person, etc.). I don't have difficulty making friends, and I often get told I'm a great friend/great person.

But when it comes to dating, I have no luck.

It certainly doesn't help that I rarely develop feelings for anyone. I often find men attractive and think they have great personalities, but I just don’t feel it. I can't really explain why sometimes I do, and sometimes I don't.

Anyways, let’s get to the point of the post: When I do have feelings for someone, they seem interested at first, but they always either lose interest or want nothing more than sex.

The first guy I ever had feelings for was one of my best friends. I had feelings for him from 16 to 18 years old. I never confessed per se, but I definitely wasn’t the most discreet about it, so he knew how I felt.

He ended up confessing to me and telling me he did have feelings for me, but that he just couldn't see himself in a relationship with me. He said we could be FWB, but nothing more serious. (The issue wasn’t that he didn’t want a serious relationship in general, because I saw him date/try to date other women before and after.) At first, I agreed because I had really strong feelings for him and thought sex was better than nothing. It only went on for a month because I realized that casual sex is just not something I want—I'm a lover girl at heart, lol.

The second man I had feelings for was a guy I randomly met, and we just clicked super fast. We entered a relationship quite quickly because he really love-bombed me—telling me I was the woman of his dreams, that he saw himself marrying me—and I was naive, so I fell for it. After three months, he ended up cheating on me with his girl best friend and leaving me for her, telling me he realized he didn’t love me. I asked him why, if I did/said something, and he basically answered: "Honestly, you’re the best girlfriend I ever had, I couldn't ask for better. But I just don't feel anything for you anymore."

The third and most recent guy I met at a party. We didn’t flirt during it, but we talked for quite a long time. I ended up texting him after the party, but he seemed really dry. However, our friends told me he was interested and just very shy.

So I really forced the conversation and kept talking to him. I thought, "fuck it, if he doesn't like me and I’m annoying him, he’ll tell me to fuck off, but at least I’ll have tried." But after a while, he ended up being receptive.

At first, things went super well. We texted a lot for a couple of days, and our conversations were super funny and entertaining. At some point, our conversation turned a little bit "horny", and after a while, I put a pause on it and told him that I wasn’t interested in casual sex and was looking for a serious relationship. He told me that was perfect because he wanted the same thing.

We kept talking, but at some point, I asked him to send me his availabilities so we could see each other. (I don’t need a super fancy date—just a little hangout to see if we vibe together in real life. I feel like texting isn’t a great way to actually know if you have chemistry with someone.) He left me on delivered for 45 minutes and then just replied, "good."

After that, he started being suuuuper dry and basically ignored my banter, compliments, and messages in general. So I gave up and took the hint that he wasn’t interested anymore.

So that’s where my worry comes in. I feel like no one is interested in having something serious with me. It’s like at first, when they don’t really know me—like the second and third guys—they’re interested. But once they get to know me, they don’t want anything serious, or they just stop liking me.

I really don’t understand what the issue is. Again, I don’t think it’s physical—if it were, they probably wouldn’t be interested at all from the beginning. I don’t necessarily think it’s my personality either, because I have no difficulty making friends and being appreciated by them.

So, am I just not "girlfriend/wife material"? But even then, I’m not sure why I wouldn’t be. I think I’m a very caring and loving person. I practically never get mad, and I’m just a calm person in general. I think I’m pretty smart and can be interesting/funny.

Obviously, you guys don’t know me, so you probably wouldn’t be able to tell me exactly what’s wrong with me. But in your experiences, what happened/could happen that would make you lose interest in a girl suddenly once you get to know her better? Or what would make you want something casual instead of something serious?

Or, if there are any flaws/annoying things about me that I seem to show through my post, let me know.

I’m not sensitive, so you guys can be harsh :)