Things, that I added or changed are in Blue, things to omit are in red, green is a suggested thing to replace with what is in the brackets in green.

Some notes:

1) Your English is not awful :). In fact, it's is not even bad. There were not many things here that I could find to change or fix.

2) I changed "friends'" to "friend's" because "friends'" implies that you have more than one best friends' birthdays coming up. "Friend's" means that it is the birthday of your one best friend (If you happen to have more than one best friend with their birthday next Saturday, then of course ignore this)

3) I suggested replacing "on the following" with "next" because it is more common. People will still understand what you mean by "on the following", but I think "next" is more clear.

4) I removed the comma after "Maybe". I don't think it is necessary.

5) "I changed that's not important too much" with "That's not very important". People will still understand what you mean the way you said it, but it does not sound quite right.

6) I changed "order" to "hire". People will know what you mean with "order" but "order" is typically used with objects. Like "I ordered this sofa", but "hire" is usually used with people when you get them for a service. You could also use "call"... ie, "I decided to hire a lawyer", or "I decided to call a lawyer".

7) The last change was changing "2" to "two". Again, "2" is going to make everyone understand, but in English you are supposed to spell out small numbers.

As for your situation, I don't know about your country, but where I live prostitution is illegal, so maybe my answer is biased and will be different to others, but I would say don't do it. In addition to my personal feelings on the subject, I think it would be wise to avoid embarrassment and lowering your self-esteem. I am sure your friend would understand.

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Seeking for advice.

Hi to those reading my journal.

My best friend's birthday is coming. It's on the following (next) Saturday. I don't know what to buy him as a birthday gift. Maybe, I'll give him some money and he'll be able to buy what he really needs. Anyway, that's not very important too much.

What's important is, he's decided to hire two prostitutes and go to a sauna with them. Personally I'm not against it at all, but I'm afraid that something will go wrong. For example, it's hard for me to relax with totally new people, therefore I'm afraid that I might not be able to get aroused. Having said that, I might embarrass myself and lower my self-esteem even more.

I'm not sure what to do. If I refuse to go with him, I'll definitely disappoint him. On the other hand, If I do go there and it doesn't work out, I might end up beating myself up for making the wrong decision.

Damn it. My English is awful.