Theravada Buddhism is primarily based around the Tipitaka - the three baskets of the Sutta Pitaka (i.e. the teachings), Vinaya Pitaka (i.e. the monastic discipline) and Abhidhamma Pitaka (i.e. a theory of mind, synthesized from the teachings).
Some of the things that occur in Vajrayana are actively discouraged in those texts, but it is understandable that there is divergence because Vajrayana is founded on different root texts and introduces the notion of a guru, which is much different to the Theravadin roles of a teacher, or a preceptor.
However as with anything, people will "take the ball and run with it"... so you will still find practices within the Theravada tradition that have no clear connection to the scriptures.
My recommendation would be to focus on the teachings for the time being, because it seems you find no benefit in the traditional/cultural aspects of Buddhism at this point in time.
Perhaps in time you may see the traditional and cultural practices as active manifestations of the teachings - or perhaps not. Either way, with a solid grounding in the Buddha's teaching you'll be able to make that determination for yourself.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)