Wow, a lot of replies! Thanks
I am thinking of graphic arts, yes...I've heard someone saying that "there aren't enough actual artists on this field", and I've been intrigued since (without knowing if it's true). It is sort of replacing classic arts on my list, since it's more practical and trade-able. I know my Photoshop and were thinking of educating myself in 1-2 more programs, for start. But that's how my train of thought works:
When thinking of art: "I need to exercise and educate myself further to go for graphic arts. Or to make tons of paintings to sell online, which'll take a lot of dedication. Can I be creative 24/7? And be fast enough to be productive? And not lose my quality, and not burn-out? What about the taxes, if I do personal buisness? Also I could probably offer greater things through science, and maybe be even more proud of myself...could art be a waste of potential? Although it looks like my calling? Worse, could I be unable to sustain a family in the future because of it?" (note: I'm extremely economic in my personal expenses)
When thinking on science: "I'll most probably need a postgraduate degree for this, from what I've seen. Or at least a lot of dedicated personal study, to persuade people that "I know". But I believe a lot in how science can shape the world and would be proud to be part of it-I made good impression in my internship too. But what if I can't be the type of scientist I'd want to be? What if I can't do the things I want and get stuck in a repetitive job instead? What if I spend my life wondering how would it be if I followed art? In general I've seen that people want my art, probably more than my science...I know by experience that the "art thing" will keep bugging me, and we only live once..."

So, you see, it's a circle...and I don't know how to get out of it. So I'm practically trying to rationalize my reasoning as much as possible, and find things that'll help me stop chasing my tail.

Spondiferous-Thanks for the positive critic Actually, I can "just find a job" for now, and if I go for art I'll have to. I can be patient, but: I think I need to make some sort of decision first, to stop acting "frozen" and make my plans. I were thinking of using science to try moving to Italy, which has tradition in both materials and arts. Yet I need to know inside me my personal long-term plan. Best of luck to you too!

Onward2wards-Good luck to you too!