Why does my sister keep encouraging me to give my guy best friend a chance when I complain about no guys I want like me?

I’ve had a few boyfriends, dates but they ended up in a disaster. I was dating this one guy for four months but we ended up hanging fights and he thought I was using my disability as an excuse and I would fight to keep the relationship but he dumped me. I am so DONE with men! My parents said I’m so blind when there’s been a good guy in front of me for YEARS. My parents really like him, especially my dad. He asked me when am I going to go on a date with him. I should ask him. But I’m not attracted to him or have feelings for him. Plus I like fit and lean guys but I know personally is important. I know I’m am a tall chubby person like he is and we’re both autistic.
I can’t go out with someone I have no feelings for. Nobody ever asks how I feel about it. It’s always the guy friend feelings they care for. Nobody asked me. They just tell me I should give him a chance. My older sister said, “The good looking and cute guys aren’t always the best partners. I mean some are but averages guys like your friend would make better partners. I mean average guys can be jerks too but still. I know you don’t have feelings for him but mom and dad seems to really like him and dad hoped that you would end up with him. There is something very special about you two. I think you like him too but you’re too stubborn to admit it. I think he’s the one for you. He’s been there by your side, since DAY ONE. He’s the only guy that kept contact with it you and you better not push him away. Even as kids, I saw him follow you EVERYWHERE and he always chooses you to partner up with a girl, he always asks you to the dance every year, he asked you out NUMEROUS times. He IS IN LOVE WITH YOU. It’s up to you, but I say GIVE HIM A CHANCE! He will NEVER BREAK YOUR HEART.” Should I just give up on other guys and just give my guy friend a chance? No other man wants an autistic, fat tall woman. I always get paired up with fat/chubby guys anyways.

Why does my sister keep encouraging me to give my guy best friend a chance when I complain about no guys I want like me?
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