I'm actually considering applying anasthetic substance (used in preamature ejaculation prevention condoms) or like get drunk and have sex.
I just noticed no one addressed this, so I wanted to make sure someone did. These are both just totally bad ideas. Getting drunk with sex not only impacts your ability to give and do consenting well, but alcohol also gets in the way of things like being aroused enough for sex to feel good in the first place. The chance of you injuring yourself is also higher if you're drunk or using something topical that numbs pain.
I do think that if you have never seen a sexual healthcare provider, it's first of all waaaaaaay late on that. You seem to be saying you've been sexually active for at least four years: ideally, you should have started sexual healthcare within that first year. So, if you haven't, you need to do that anyway so you can get started with pap smears (cancer screenings) and also your STI testing (something your boyfriend should be doing, too). When you do all that, you can also ask about this. It may be you have had something like an infection that's causing this problem, in which case, treatment could fix things right up AND keep you from getting really sick from having something untreated for a long time. Just so you know, if someone hasn't actually been tested for infections, they can't know they don't have them. Testing is the way we find that out.
I'd fill a sexual healthcare provider in on this with all the details you have here, and see what they say. In the event they feel like trying something to reduce your pain is the way to go, btw, what they will more likely suggest is doing something like taking an oral analgesic (like ibuprofen or naproxen), not booze or something topical.
Do you know where to get that kind of healthcare?