I'll bite. Young, I won't tell you what to do, just make a few strong suggestions. Jumping right into a 50ft range from never owning a boat will be an enormously drastic shock. It is better to begin smaller and graduate in size as your abilities and confidence allow. If you are looking to just jump into a large sailboat, I would recommend you not exceed 35ft (preferably 30ft) for the first few yeas. These vessels will be comfortable in both size and complexity. Just be aware, that at that size, you will escalate the learning
curve into a cliff.
My suggestion, at your age and skill level, without undermining your spirits, would be to get yourself into a Westerly Centaur 26
or equivalent and get you feet wet single
handing. The linked example is the best a quick search on yachtworld was able to find.
Either way, dream big but temper your choices. You have plenty of time to get into a massive yacht.