Wasting my gap year rn

Im 18 and finished school just over 4 months ago.... And I've done fuck all in those 4 months. 90% of the days have been completely forgettable and useless, just waking up late laying around wasting time online etc. haven't even been consistent with working out and stuff. Only thing I'm enjoying rn is I started training Muay Thai which is fun. Apart from im just bored to death, lacking social contact( see my friends like once a month) and being unproductive.

I had all these plans, like going on adventures and stuff, I was thinking in the summer I'd go and pick a direction and just walk for a few days and see what happens, or go to a different country by myself for a few days. But I never got around to doing anything like, kept putting it off, being scared what my parents will think etc.

I just need to say fuck it and go do something unusual instead of rotting indoors.