@Surya Deva
When I mention teachings of Sikhism, I do not base them upon what common people from Sikh community do( many from the sikh community might be the worst of the humans, but thats the case with every community) . I base them upon the teachings enshrined in Shri Guru Grantha Sahib. So if you met meat-eaters and alcoholics, well they were not following the Sikh teachings, simple.
The language of Guru Grantha Sahib is not Gurmukhi. Gurmukhi is the script in which Gurbani has been written. The language of Guru Grantha Sahib is predominantly Punjabi of those times but vocabulary and phraseology of many other languages is also found. All the ancient texts are not readily understandable today as languages change over the ages. But if one understands Punjabi well enough Gurbani is not that difficult to understand. And there is no dearth of books either.
It is unfortunate that you could not find anything worthwhile in the Gurdwara you went to. One would think it would have been easy to access some library and read some good books and get knowledge first hand.
This is not the place for me to argue whether Sikhism is a sect of Hinduism or a separate religion.
Finally, a Yogi is the one who tries to slay the five demons:
Kama(lust), Krodha (anger), Lobh (greed), Moh(attachment), Ahamkara(ego)
I advise you to be patient, loving and humble. Just as water does not flow towards the high ground so the divine grace of God does not reach the heart which is arrogant.
If not the Sikh Gurus I hope you heed Saint Kabir’s verses, who most scholars agree was a Hindu bhakta:
Kabeer, let yourself be a pebble on the path;
abandon your egotistical pride.
Such a humble slave shall meet the Lord God. || 146 ||
Kabeer, what good would it be, to be a pebble?
It would only hurt the traveller on the path.
Your slave, O Lord, is like the dust of the earth. || 147 ||
Kabeer, what then, if one could become dust?
It is blown up by the wind, and sticks to the body.
The humble servant of the Lord should be like water, which cleans everything. || 148 ||
Kabeer, what then, if one could become water? It becomes cold, then hot.
The humble servant of the Lord should be just like the Lord. || 149 ||
But my friend, everything starts from humility.
Peace