How to overcome jealousy

Hi, i have a problem with jealousy.

I am with my boyfriend for almost 7 months and recently, i have been very jealous of lots of things. How to overcome it?

For example, I am jealous when he spends time with sb else cause I want him to be with me. I am jealous of girls on the street that he looks at or girls in porn. I am jealous when he likes pictures of girls, especially half naked famous women, which he follows (3 of his favourite djs). I trust him that he loves me and he tells me all the time, but i hate these things. I think it is because I dont love myself, but it is hard to start loving myself.

What sould I do? Is it reasonable or am i just crazy? Please help me, I do not want to loose him.