Help me with my Self esteem issues?

hey guys my name is jess and im a senior in highschool. lately ive been having such bad self esteem problems. i know everyone gets insecure sometimes but lately its been more than usual. it gets worse around my period when im pmsing as well which i know is normal. but today i couldnt even look at myself without wanting anything to not be me. yesterday i went in the dressing room to try on a bikini and i literally almost cried hysterically. my thighs and stomach looked fat and my shoulders look broad and my chest looked so flat. and then i looked at my face and my skin and i soon began to hate everything about myself. i feel like this self hatred has just been getting worse and worse. its at the point now where ill look at other girls who are skinny and pretty and i will want to trade places to be just like them which i know is horrible. and people will tell me all the time how gorgeous i am and how i should model and i have beautiful feautures and what not. and guys do ask me out. and dont get me wrong i have my days when i feel pretty. but none of it ever seems enough. i want to feel beautiful inside and out, without people having to tell me i am. and im also going on my senior trip very soon and we have to wear a bathing suit and i know im going to envy all those other skinny girls. i think the thing that bothers me the most is that i know guys love these "victoria secret" type of bodies and looks of girls which i rreallly do not have.. any advice would be great thanks :)