I have gone through that list and I can say that I experience all 5 of those at a small level. (Except Joy and bliss I don't know the difference between the two). That is what the confusion is for me.
I don't think I am in first jhana yet because the the one pointedness and joy are not that strong. Should I keep doing what I am doing and expect it to grow? How powerful should the bliss and one pointedness be before I am sure it is first jhana?
EDIT: Upon further research it seems that I experience more bliss and a little bit of joy.
Good to know that you have done some reading of our resources, which helped you to realize that you might be experiencing jhana already, because the first step in leading a fruitful contemplative life is to understand what the fruit are, and how one attains them. One will also realize that no mainstream religion has ever understood or valued a fruitful contemplative life, and typically marginalizes those who arrive at one.
The other thing to get is the 8 stages of depth in meditation (samadhi) are relative shades of grey, and not fixed points. Thus, the first stage is not extreme bliss, ecstasy and joy. It is simply a relative increase in the bliss and joy factors, which you recognize that you have found already.
The next key step for you is to realize that reifying of your meditation technique, the teacher, teaching and religion will not help you. You will have to learn the subtle step in progress in depth in meditation, where both your mind becomes still, and the meditation technique stops, while maintaining onepointedness, and deep relaxation. So, relaxation while meditating is a critical skill to develop.
Sam is right, but I agree with you, there is no point in obsessing over enlightenment at this time. Just give yourself some time to make progress. Because, you sound like someone who will make rapid progress from here on out, so keep it up, and explore the interior terrain, and please do report back to us your results for the benefit of others.