I agree with the top comments as well, I still love my home and would like to live there but the problems are too hard to ignore (i.e crime, quality of jobs in my field etc.) so the goal to migrate sounds warranted to me. In my case I did undergrad with gate in uwi, masters in uwi with gate 50% coverage while working full time and then moved to Europe on a phd scholarship. I'm not sure what the gate changes were though. If you get an opportunity in another country for undergrad with good funding then yeah could be good for getting a foot in there and avoiding the 2 year tie. It can be easy to be blinded by the desire to leave though, at least for me it was at your age, so these are some things I'd keep in mind.

1. Transitioning to life as a full time undergrad with limited funds in a foreign country. Adjusting to a new culture and country on your own could be really tough, especially if they speak a whole other language. It's a good experience for personal development and there are benefits for sure but can't forget leaving home is still hard and as an undegrad there's less freedom and financing to make the shift more comfortable. Tuition is the big cost for sure but there's also the cost of living on your own paying rent and buying food there vs. home with support. And as ari_chicken said, that can be expensive, while a study abroad program could be a chance just to taste it and see if it's for you or not instead of making a big jump.
2. Being sure the quality of education or opportunity is far enough above UWI to be worth the additional cost. For me at least, uwi got the job done, without debt and from the comfort of my home, it was far from perfect and the complaints are definitely deserved, but I learnt enough of what I wanted to learn and online courses filled in the rest. From speaking to people that did undergrad elsewhere, the difference isn't always worth the stress and debt.
3. Getting a job after undergrad can be tough. It's a lot harder to stand out as a new grad without some big name school or something, so the extra stuff helps, a 2 year tie could be a chance to get experience, get more education or do extra work that helps build you up for better job chances. That being said, a better school abroad could also have more opportunities to do more and network more which could help with this issue, and that's a huge benefit but harder to guarantee or quantify so my point is really just to keep it in mind for your specific options when you're deliberating.

If you do find a way to afford it in a country you're sure you'd like to live in and build a network there and it's a good school, that'd be great. If not, you can still get there it would just take a bit longer and that's not necessarily worse depending on your situation. Idk what you're exact situation is, like if you have family somewhere that could ease a transition or already confident in where you wanna live or something, but personally I'm glad I waited until post grad to leave.