I always makes meget nervous because ofabout dates.

What the other person suggested is also correct. I wanted to give you another way of saying this.

The explanation needs to go before "makes me" in a sentence:
"Dates (always) make me nervous."
Where a "date" is what makes you get nervous.

If you want to say "dates" at the end, you can say "...when I go on dates," like the other person suggested.

If you want to focus on your feelings, instead of the thing causing them, you can say "I (always) get nervous about... "

I am a man, so I want to satisfy girls, and give them a good imagespression.

This sentence is a little awkward. Maybe "I'm a man, so I want to satisfy my dates and leave a good impression."

You could change "my dates" to "women," or "leave a good impression" to "give a good impression," if you prefer.

So I sometimes I feel I have to act like a cool guy, like treating them to dinner them.

I might be wrong, but I think you are saying that needing to act in a certain way puts pressure on you and makes you nervous.

So I included "(Sometimes) I feel I have to act..."

I corrected the phrase "to treat someone to dinner" a little bit. You were very close!

We also have to entertain them in conversation.

I think you are still talking about the pressure you feel as a man on a date, about how you need to act. If you are speaking about just yourself, then you should use "I" instead of "we."

If they look like bored, I feel sorry towardfor them.

But a more natural way to say this is "If they look bored, I feel bad for them."

I had a good time and she looked like fun, howevershe had fun, but I was so nervous, I couldn't really eat dinner a lot.

"however" and "but" do mean similar things, but in this case "but" is more natural.

You could say "I couldn't eat a lot of dinner," (word order change) but I think "I couldn't really eat dinner." sounds more natural and casual.

I want to cure thiswork on these bad habits.

You don't really "cure" bad habits. Anxiety can be treated, but you describe it as "bad habits," so I think you want to change how you react to dates or what you do on them.

"to work on" something means you want to improve, even if it is a little hard or might take some time. This is a very natural phrase, and can also be used for personal life, school, jobs, and hobbies:

"I'm working on eating a good breakfast everyday."
"Want to work on homework together at the library?"
"He worked on that painting for a week."

I am always makes me nervous because ofnervous when I go on dates.

It is either "I am always nervous" or "It always makes me nervous."

I am a man, so I want to satisfy girls, and give them good imagesmake girls feel good.

I wouldn't say "satisfy girls" because that means you want to have sex with them & you want them to enjoy it (unless that is what you meant)
"...and give them good images" doesn't really make sense - I think you wanted to say you want them to "feel good"?

So, I sometimes have to act like a cool guy, like treat dinner them by treating them to dinner, for example.

act + like
Another example:
"My kid is acting like a cat; she is sleeping for the whole day and up the whole night."

WeI also entertain them in conversation.

If you mean "men" with "we", then say this to make it sound more clear:
"Us men also entertain them in conversation."

If they look like they are bored, I feel sorry towardfor them.

sorry + for (someone)

I had a good time and she looked like she was having fun, however I was so nervous, that I couldn't eat most of my dinner a lot.

Someone can't look like fun, but rather look like they are "having fun"
Fixed the rest of the sentence to make it sound clearer

I want to curefix this bad habits.

Saying "fix" here sounds better than "cure". I'd use "cure" for when you are curing a disease, but fix for fixing something that is physically broken or fixing an attribute/quality about yourself.

"habit" instead of "habits" because it is only one habit