Getting jealous over this.. stupid or normal?

So like I get jealous when a person in a couple compliments their partner in front of me like I feel ugly. I know its their boyfriend/girlfriend and that's their job to do that and they're just trying to show their love/make their partner feel happy but I hate when they have to do it like right in front of me. It doesn't even have to be a couple it could be a friend or someone and I'll feel jealous cause I feel left out.

So I have social anxiety and I'm really quiet and I'd say I'm pretty weird and immature for my age. I'm always left out of groups and talked over when trying to talk and it really bothers me. So I'm usually always the third wheel. I never really had a boyfriend. I'm always online since I'm scared of people and have a hard time fitting in. I've tried talking to people like joining in conversations and it never works out. I don't know why. It makes me feel like something is wrong with me. I guess it's cause I talk soft and mumble. Well that's what my siblings and moms says. I get picked on my family a lot and they leave me out on stuff too so I'm pretty insecure.

Well a couple weeks ago I was with my aunt and her boyfriend. My aunt is 26 and her boyfriend is a little older. They were dropping me off but before they took me home they took me to In N Out Burger and we were talking about the night before when me and my aunt, her friend, went to the gym and they were saying a guy was staring at him. I saw him looking through the window (the window was black) so I was like "Well I did see him looking through the window but I don't know if he was looking at us or not." And her boyfriend was like "He was probably looking at "Aunt ___) and said her name. I was like "Well it was only me and my aunt." and my aunt sort of changed the subject. I felt ugly when he said that though like how could you be so sure he was looking at just her? It was me her friend and her. Then on the way home my aunt asked what was I thinking about and I was thinking out loud or something and I was like "I'm just thinking about reality and people online. People online always seem more open whereas people in person seem like a rock." And my aunt was like "Yeah, you act differently online than you do in person." I'm like "How?" and she's like "You seem more outgoing." So on our way to my house her boyfriend was staring at her and I knew they were looking at each other thinking I was weird or something but I didn't sleep at all the night before so I was half way awake.

So there was another time when me and my aunt and her friend were talking about natural beauty and my aunt was like " I just shower, throw on clothes, and leave." and I was like "Me too." and her friend was like "Only your aunt ___ can pull off the natural look" I felt offended and didn't say much after she said that. I never wear makeup only really rarely so that kind of made me feel ugly... Me and my aunt have a similar personality and a lot of people like her so that also makes me feel ugly and makes me think "Is there something wrong with me?"

So this is another story. My sister is 17 and has a lot of friends my age. Her boyfriend is 21 (My age) and my sister was sad "me and my sister look the most alike." and her boyfriend was all shaking his head no and said that I looked like my youngest sister. Which I know we don't. I look more like my other sister. Me and her look like my dad while my brother and my youngest sister look like our mom. I'm not saying she's ugly cause she isn't at all. But it made me feel offended since he was shaking his head saying "no nope."

I know this probably sounds stupid and I know that they're just trying to make them feel better, being a good partner and giving them compliments but do they really have to do that in front of people? It doesn't even have to be a couple. It's just regular people that could give someone a compliment and then leave the other person out like they're nothing. It just makes me feel ugly and jealous. I always feel like there's something wrong with me since I'm left out on a lot of things. I feel more comfortable with people online and accepted. They all seem to understand me more and they call me beautiful and they notice me. It's the opposite in person. Does anyone else feel this way or get what I'm saying? Yes, I know I'm insecure...