Dharma is Dharma... there is no difference in any lineage you pursue. If you have a Buddhist temple near you, be grateful and pay homage to the Buddha in the temple.
The basics of Dharma can never be any different, it is all the same in all lineage. It is only the higher practices that when the difference of the Buddhist schools is apparent. So go ahead and study the basics and practice it.
If you love Theravada lineage, then do listen to Ajahn Brahm's youtube teachings. I'm from the Vajrayana school, and still I love listening to Him, so much wisdom and very practical teachings that has helped me lead a happier life after I start applying it to my life. Just google Ajahn's name and you will see so many teachings there... I love His teachings.
The point is, never make an excuse for yourself. Although you've mentioned that you wanted to be ordained as a monk... never let anything hold you back because being a monk you can help many and even your family. The Buddha did not leave his family because he thought it was a selfish act, but because seeking Enlightenment is above all that is important in life. Family and friends, we can only help them so little if we remain the way we are... but with great Dharma practice, we can help them tremendously, even at the point of death, which is the most important moment for us all.
I wish you great accomplishments in this life, may you gain great attainments.