I get the initial impression that you prefer theoretical, analytical aspects of aircraft more that crawlinging around inside a wingbox holding a rivet buckbar or whatever, but you do not know exactly what disciplin you want to go into.
If that's the case, I would try to get into one of the bigger aerospace firms. Some have graduate programs lasting for a couple of years which cycle you around different departments every six months or so, so you can get a feel for where you might slot it. Even without this, if you find yourself working on something that doesn't interest you, in a bigger company it is easier to move sideways into a new area if your current one does not suit you.
These graduate programs can be good, but usually the people on them have show initiative and push to get into the departments that they are interested in, otherwise the programs just let them drift. You hear about mentors and coaching and and things like that, but from what I've seen it is really up to the the individuals involved to get the most out of the programs that they can. At the end of it, you should have a good idea of what projects and disciplins you like, and you've been paid to find out.
Previous commnets about being a small cog in a big wheel at these places are true. That's not necessarily bad because it might also mean that you have a lot of support from your colleagues and are given time to learn new techniques & practices. Maybe after a few years experience and confidence-building, you might want to think about moving to a smaller company or contracting, where remuneration is sometimes higher (and job stability is always much lower). A general trend, although not always true, is that staff at these big firms spend more and more of their time writing requirements and reviewing suppliers' work, and less and less time actually doing the analyses themselves. Maybe that appeals to you, maybe not.
Whatever happens, good luck, and young recruits that show a lot of initiative & enthusiasm and who go for it are the ones that get noticed. Do not be afraid to make the occasional mistake in the process of pushing yourself forward as this is not usually seen as totally awful, at least not at a larger firm. Nobody should be expecting a recent graduate to get everything right all the time by themselves. How you fix a mistake is usally more important. Work hard to overcome errors and you will be seen as someone who drives to get the job done and can be trusted to cope with the inevetable hiccups on the way.