I seem to be heading in the wrong direction. 

参考译文：我好像正在朝一个错误方向行进。

句子语法结构分析如下

主语：I

系动词：seem

表语：to be heading in the wrong direction

备注：表语为不定式进行体充当。

解答如下

seem 为 表像系动词，后可以接名词，形容词，介词短语，分词，不定式，从句。

(1)seem+adj.

The young girl seems much better this morning.
今天早上那个姑娘看上去好多了。

The man seemed familiar, but I could not quite place him.
这人很面熟,但是我记不清在哪儿见过他。

Why does your mother seem so sad lately?
为什么近来你母亲这样愁容满面?

(2)seem+V-ed

She seemed very excited that day.
那天她似乎很兴奋。

He seemed not interested in doing anything those days.
那些日子里他好像没有兴趣做任何事情。

He seems quite contented and happy all the time.
他好像总是非常知足和高兴。

(3)seem+prep.phrase

He seemed a bit under the weather.
他好像有点不舒服。

You don't seem in high spirits today.
你好像今天情绪不高。

The driver seems out of humour these days.
这个司机好像这些天情绪不高。

(4)seem to do sth

The beautiful girl's coming seems to scent the air in the hall.
美女的到来,仿佛使空气中增添了香气。

The dog seems to like that bone.
狗好像很喜欢那块骨头。

I can't seem to stop coughing.
我似乎无法停止咳嗽。

(5)seem to have done

She seems to have camped up the third act of the play.
她在第三幕中表演得似乎过火了。

The teacher seemed to have caught a cold.
老师好像感冒了。

She seems to have missed the train.
她似乎没有赶上火车。

I seem to have seen him somewhere before.
我觉得好像以前曾在什么地方见到过他。

(6)it seem that

It seems that you are lying.
看来你在撒谎。

It seemed that nobody knew anything about the matter.
好像谁也不了解这件事。

It seems that no one knew what had happened.
似乎没有人知道发生了什么事。

(7)it seem as if/as though

It seems as if you are the first one here.
看起来你是第一个来这儿的。

It seemed as if the night would never end.
黑夜似乎无尽头。

It seems as though it was spring already.
现在好像是春天了。

(8)it seem+adj/n. to do sth

It seems good to have a drink now.
现在喝点什么倒还不错。

It seemed a pity to refuse.
拒绝似乎是可惜的。

(9)There seems to be+n.

There seems to be trouble soon.

好像不久就会有麻烦发生。

There seems to be a mistake.
好像有一处错误。

(10)there seem to have done

There doesn't seem to have been any difficulty over this question.
在这个问题上似乎没出现什么困难。