How do i learn to accept myself for me?

I'm asking for your advice, this may seem really boring or irrelavent to some but it's a big issue for me. I was always a chubby child and got spotty as a teenager, although i was confident enough to laugh any comments off. I'm now 26 and although people compliment me on my appearance and figure, i cant seem to believe them, i think they must be joking or something. I'm 5ft 6", my measurements are 38-24-38 and i weigh 140lbs, so firstly do you think i'm still fat? Also when i look in the mirror i just see the bad things like spots or think nothing suits me. I 'm always planning a diet or thinking about how i should change myself , also i find it really hard to find clothes that fit me properly because my hips are so wide , so in the end i just dont even try things on when im with my friends. Secondly, how do i accept myself as i am and stop being negative about myself and wanting to change how i look? I would really love to hear some advice so i can just let go of my troublesin my teens and be a confident girl. Thankyou xlolx