ok, so here's my story:

I started playing poker about a year and a half ago. At first it was just a hobby, well, not even a hobby, kind of thing that i would do when only my friends were around. Long story short, after a while I got into online poker after watching youtube stream highlight videos and was surprised how hard and complexed the game was. I started playing freerolls on ps and more i played, more i fell in love with the game. It didn't matter that i wasn't winning a lot from 10$ freerolls (duh) but i just loved the experience. So with the money i won from playing freerolls, i fired up some actual micro stakes tournaments and won 25$.
After that, i seriously started thinking about building an actual bankroll and was fortunate enough to win up to 100$ and that's where I am right now. It's not much, i know, but putting in perspective my age and the fact that i got there from KIND OF NOTHING, I'll take it

So now that i have an actual bankroll that i can work with the main question is: what do i do now? do i play cash or MTT? I have to say i enjoy both, but if i had to choose, i'd probably go with tournaments but, then again it's only 100$ and i don't have a lot of options since i can only play on micro stakes.
cash st least seems more stable to me. I dunno.

Anyway, would love to hear your suggestions and experiences! Thanks!

IMO MTT's are much softer than cash, so I prefer MTT's and would suggest the same. Although playing cash would make you a better post-flop player in the long run, while MTT's focus on pre-flop & short stack play. With 100$ roll you can comfortably grind 45 - 180 man MTT's on stars. The only problem with MTT's are the high variance and sick swings... some people just can't handle the common downswings and give up half-way. If your BRM is on point, then try out both and see where you perform best.

Anything other than HE, game is boring

I would go with this since it is what you prefer. I'm a cash game guy myself so I don't have a lot of advice to offer other that do what you find most appealing.

I think the rule of thumb for MTTs is 200-300 max buy-ins in your bankroll. So, you are looking at sub $1.00 MTTs. I just checked BetOnline and they seem to have games under $1. If you run out of cheap MTTs, just play some 2NL and see how you do.

Go with what you find most enjoyable. To that end you'll probably need to play a bit of everything for a while to find what you enjoy most. 6max sngs are the easiest way to make money in online poker imo.

I play whatever game I feel like it. At this time I am an omahas player (plo, plo8, 5-omaha) but at some other times I again will be a nlh player, cash likely, but I have been a nlh mtt player also, and a limit holdem player.

And I have played tons of non-poker games also, but not much anymore, but hearthstone, barely.

I do investing also, but it needs big rolls to be as good as poker can be, so it is at sidelines (small small time investments) at this time.

I might be playing mixed games in the future, if they get popular enough, that isn't likely, but at this time I favour omahas for more action, fewer details (the plo gto is invading space but one can see much on the board), more feel comfort (partly an illusion but it keeps talking to me), at this time feeling more comfortable about it, but that might change anytime, especially as I know nlh like top well, any number of players and mtts, being basically complete, just being fed up with the cold or so feel of it at this time (at other times I like to play the superior strategy I have and adjust it when I see fit) and grinding the details of the details with the gto softwares, as the game is further advancing. I don't like that but prefer to gamble and use my own judgment rather than play up to 100% of the time my preparations only, although I need to adjust quite a bit when I spot a range that is not balanced, and so at other times, I like that instead.

I'd jump straight into $3.50 single table SNGs. Can get real boring but they are fairly easy to beat. You definitely gonna need to multi table though...

Play the ones you feel the most confortable at the ones that you cant wait to start the day to open your poker cliente and load a session, play the one you enjoy studying for, play the one that gives you joy and everything else will fall into place.