Is it possible for a FtM to exercise himself into looking more masculine? How?
I go to a fairly normal gym twice a week. Is there anyone who knows if there is anything special I should concentrate on whilst training there? I lift weights in different machines, mainly (only 20-30 pounds each, hehehe, but I am very weak)..

look at buck angel..
He looks damned sex.. I mean.. masculine!

Heck, look at some of those female "professional" muscle-buffs..


And then.. Work out the areas you want to make "larger".

Yes, but I dunno what I should make larger! I mean... if I exercise some part of my body, would that make my curves more or less visible? etc etc. Can I exercise my chest blobs away? etc etc.

I'm assuming we're talking mostly about chest and hips as problem areas, and maybe thighs...there's no spot fat reduction that can be done, but adding muscle can make certain areas of fat sit a little differently.  For example, working out one's chest will make the breasts sit higher up, which in turn helps with creating a more realistic chest while binding.  However, they're not going anywhere--that's dependent entirely on fat loss.

As for hips,  you generally want to work out anything that will make your upper body and outer legs wider.  So lots of wide grip pull ups, shoulder presses, etc; lots of back exercises; hit your lats, abs, obliques, to help create an upper body 'V-shape'; and then hit your quads and hamstrings to make your legs appear thicker as well.  In comparison your hips will be a lot less noticeable.  In general, resistance training any part of your body will help make your curves less visible and give you a more masculine body.  Free weights are king.  Best of luck!

I got stuck in body sculpting with the girls in school rather than weight lifting with the guys but my teacher helped me to get on a routine to build rather than sculpt. The main thing she told me is less repetitions but more weight. An ex. was she had the girls doing 15 repetitions, 3 sets when lifting 10 lbs. She had me doing 8 repetitions, 3 sets with 20 lbs. Keep in mind though that's just an example, I started out in bad shape lifting 5 lbs weights, every person is different. I left that class which was only about 5 months long with more muscle, a little less chest (there are exercises to reduce chest "fat"), and smaller thighs so I think it is possible. But Quicksand is right there isn't spot fat reduction that can be done. Just some exercises that happen to help out those spots along with doing other things. I don't honestly remember what specifically I did because it has been two years but my teacher told me to look up exercises men with larger chests did to help. Side note: that was not meant offensively just don't know another way to word it sorry

Lift free weights. Big ones. Try to lift bigger ones every week. That is all.

The particular exercises you'll want to do are ones that target your upper body, especially shoulders - the only way you'll make any progress on lower body is just fat loss, which you get from diet/cardio to an extent and also from the extra calories you burn having more muscle up top.

Machines aren't great as your main event. Next time you go to the gym, look at the really big guys (actually, look at the guys in general) - they're not on the machines. They're lifting free weights, only using machines for particular muscles that are hard to get effectively. Do what they're doing (but with lighter weights...but not too light, you want heavy enough to be able to push your muscles to failure in 8-15 reps).

https://www.susans.org/forums/index.php/topic,84528.0.html
We had a great post on this made by bibilinda a few days ago. I've linked it here and given it a bump for you.