I am 14 and have developed a lot, and I feel uncomfortable by the attention

I’m glad you are at peace now.
Gonna tell you an anecdote.
My sister have breasts implants settled. I’m not a lesbian but I found troubles to avoid looking at her breast. it made me embarrassed but I couldn’t avoid sometimes my sight stopped just there.

When someone or something is attractive or beautiful is pretty unavoidable to look at.
And men, for nature, are tremendous visual.
Some women get used to it. But I see shy ones have a bad time. It happened to me.
Just the only idea of being stand waiting for the traffic light changing color and the guy opposite staring at you, it was a bad moment. Very uncomfortable. I usually wear sunglasses in spite of not being very fan of them.

Yeah, I can relate to that too.
I thankfully live in a town where most people are nice to each other, and there aren't really any bad things happening that often, so I rarely experience any direct harassment.

There are of course a few situations where I can feel extra vulnerable;
a few weeks ago I ended up alone with a guy in an elevator, and he was probably at least 6'5 and had an intimidating build (it was close to a gym, so maybe that was why), and that moment was a bit scary, since I realised how easy it would have been for him to just stop the elevator and do whatever he wanted with me.
Thankfully, he didn't really pay much attention to me, other than smiling a bit and saying hi to me when he entered, but that was it.

It seems you feel very intimidating because of your length in comparison to others.
I know you can’t take weapons. Here, pepper spray is also considered a weapon but I take with me a hair spry. Just in case I need it.

I was also wondering if you could learn somewhere a little of personal defence. It’s never a wasted time.

Thanks for your tips, everyone.
It seems as if my breasts have settled at 32DD, so I have thankfully not experienced too much back pain or anything like that.
I also haven't experienced any harassment or anything like that, just some quick glances from some guys who always seem to make sure to not make me feel uncomfortable, and I don't usually get myself into situations where I am alone with someone that I don't know.
And like I said, the guys who I meet at my gym in the mornings are always kind, and simply say hi to me when I pass them, and let me be the rest of the time, although we can of course have some brief small talk, and those normal kinds of interactions have to be allowed to happen, too, after all.

I might give self-defense a try;
it does seem quite fun too, so that could be one motivation as well.

32DD is a perfect size. Glad everything is working out for you.

Thanks, they are at a size so that they for my overall body size are very noticeable even under loose shirts, but not too big or anything like that, so I am comfortable with it.
I have noticed that I find some sports bras quite comfortable as a regular wear.