Why are the majority of guys seeing me as a sexual object and not as a girlfriend?

I am 21 in my junior year of college. Mostly I get picked on by guys and even girls for an apparent disability I have. However, lately other guys have just been seeing me as a sexual object to want to just bang and leave, and not girlfriend material. Guys would message “😘” and ask for nudes and other stuff from me and I keep having to say no cause that’s not what I want. I’m not the type of person to mess around. I respect myself to where I know I deserve better of being in a respectful relationship with a guy who loves everything about me, not just my body. To guys who are popular, they see me as trash, but other guys just see me as a sexual object. I don’t dress all showy, I dress modestly in a classy way. I do workout all the time just cause I love staying fit and it keeps away my depression episodes I’ve been having throughout this year. Heck I’ve never flirted with a guy before (except my past boyfriend when him and I were together). I don’t get why this is happening and why guys just don’t see me as girlfriend material to keep. My ex saw me as girlfriend material to keep cause he told me I’m very sweet, quiet in a cute way, caring, understanding, loving, thoughtful, and faithful (as in I would never cheat (and I never have and never will)). We never got into any fights because both of us understood each other and made efforts for each other. one day he left me cause he said he wasn’t good enough even though I kept telling him that’s not true and always treated him right. I just don’t understand why guys see me as a sexual object and not as girlfriend material to keep. I am currently not open for dating as this year has really been rough on me between my past boyfriend breaking up with me over 7 months ago and then the random depression episodes with this year. But I’m just wondering why guys only see me as a sexual object and not girlfriend material.
Why are the majority of guys seeing me as a sexual object and not as a girlfriend?
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