I've been talking to a guy (my so call bf) for almost a year and we live in different countries. We plan to meet soon and also spend nights together so we might have something intimacy like making out during nights (we won't have real sex anyway)

And what I'm worried is that
I have a very flat chest, my breasts aren't even full for A cups. I'm skinny but I have cellulite on my butt - thighs and I have big belly which is bigger than my breasts. I have acne, scars on my oily face and on my body. I also have acne scars over my back - chest - stomach - neck and arms. Now I hardly have acne on my body or sometimes I have mild acne on my chests but my bad scars still exist. I don't have a smell on my body and he always says the smell is what could attract him. And I have very oily skin which makes my face and my hair greasy very fast.

But well, I wear makeup and I wear bras with some pad which help me look good with tight clothes on and look like I don't have that bad skin. He saw my pics and I know he already thinks I have at least B cups and normal skin.

Now the day we meet is coming and I feel very worried and bad with how abnormal - ugly my body is :( I really like him and I'm afraid all these will become huge turning off for him

How do you guys think? Am I that bad or this is acceptable?
What could help me get better? And what should I do about him?

You will make out, but you won't have real sex? Anyway, don't kid yourself. I would imagine this is his first goal I would imagine.

I can't give you an opinion on how you look; what you describe is what you think probably the worse case scenario but all I can say, is go with it. Will this trip to see him cost you a lot of money. I know you say you live in different countries, and if it will cost money, I would have to think twice about a man you have only talked to or seen on line

I agree with tickle. No matter how much you talk and see each other online, you need to see each other in person A LOT before you get intimate. Tell him so! There is just so much that two people can't know about each other, and that includes how they live, what their families are like, what some of their quirkier habits are around the house, the list goes on and on.
As for your body - maybe he's not so perfect either! Don't all the perfect bodies have tons of suitors? People who meet online and stay with each other for a year tend to not attract people around them. Looks is one thing - not a big deal if two people like each other. What worries me is personality and character. You don't get a sense of that until you spend time together, all day. Don't even think about intimacy yet.
You can give little hints AFTER you have been in person for a while, such as saying that you wear clothes that lie a little. Most of the world doesn't look so hot with their clothes off. We just see the ones who do.