what if no one ever loves me?

I (f21) have been in 3 relationships, one lasting 4 years. However, I have never once felt loved by someone and i’m starting to think that maybe it won’t happen for me.

I have always been the one who initiated the relationship, always the one broken up with, and in two of those relationships I was also the one to say I love you first (was reciprocated at the time in the first relationship but in the second he never ended up saying it). The 3rd relationship didn’t last long enough to say i love you. Despite being in these 3 relationships I have never felt actually wanted or desired by someone, and all 3 of them ended with the guy telling me he didn’t want me enough to be with me.

I’m starting to feel like there’s something wrong with me, like maybe i’m fundamentally unloveable. When I think of my life I truly can’t imagine someone actually being in love with me, someone who wanted to move in together and propose and be with me forever. I realise that I am still very young, but by this point surely I would’ve atleast experienced someone having true deep feelings for me? I so badly want to be someone’s girlfriend, and have them actively reciprocate my feelings. And a part of me even wants to know what it’s like to be the one who likes the other person less, because i’m just sick of feeling like i’m chasing every person i date.

Maybe I am destined to be alone?

Some additional information, I’m high functioning autistic and i’m quite an emotional person, i develop deep feelings quite easily and im very affectionate. I’m starting to worry that im just too much for people