Feeling jealous in a relationship

[Human]

I can't help being jealous in my relationship. It really annoys me when my girlfriend has her wallpaper as some attractive punk emo guy with black hair and tattoos who looks nothing like me, it wouldn't mind me if it was just a celebrity or someone like that, but to me it shows that I'm obviously not her type if she finds someone like that attractive.
It sounds really stupid and I know she's obviously going to find other people attractive but it just really gets me when she likes the ask.fm answers with thousands of likes and the guy who created them is some 16 year old model who is obviously more attractive than me. It really makes me self conscious and I don't understand why people follow celebrities etc. personally and I never do anything which I think could annoy her, for example liking other peoples photos or saying about other girls in front of her.
I just needed to vent really but any advice is appreciated

[WeAreOneRepublic]

Firstly, people follow celebrities because they are counted as role models in our western society. We want to be similar or do similar things to them because that makes them look 'cool'.

Secondly, speak up boy. Problems don't get solved from you sitting in front of a computer screen feeling sorry for yourself. Talk to her and ask her why she likes that desktop backgro(casually, not like an interrogation).

Thirdly, if you weren't her type of guy in someway or another why would she go out with you? If it all fails and to turns out she didn't have feelings for you when you were together then she looks like the bad one.

I wish you the best mate

[Human]

I understand why but I just don't really like the idea :P I follow a few celebrities personally, but only ones I think deserve it and not people who are just known for reality tv shows or being attractive teenagers on tumblr etc.
I asked her about half an hour ago and as I expected she was quite shocked or even annoyed when I told her that I didn't like the idea of her thinking other people are attractive. I told her I knew it's stupid but I'm insecure about the idea that they're maybe more attractive than me. At least she knows now but I don't think she expected me to be as insecure.
I think the fact that we're going out is the reason I'm so insecure, it happened before when I was just talking to a girl and she'd like other peoples photos etc. and I'd get jealous, but my girlfriend is perfect to me and I don't want to lose her which I think is why I'm jealous.
thanks :P

[WeAreOneRepublic]

Sort of similar thing happened to me happened when I was in my relationship. Not the same circumstances but I just felt jealous when my girlfriend spent time with other guys (not sexual) because we didn't really spend time together and there is the ball rolling. Our minds work in funny ways.