Only during this last year -did I understand- how -important social life is for me- (and I want you to know that I'm such a shy and introverted person). So probably without my actual close friends, my life would be really boring. --You can also say, "So it's quite possible that, without my close friends, my life would be really boring." Yours works. It's just a little cumbersome. Another thing -is maybe- good health. You know, If you don't have any physical complications- or problems,- you can do literally whatever you want. Nothing can stop you, except yourself. The last (but not least) thing is the sea. I don't know how to explain this point but I'm - so in love- with the sun, spending days by the seashore, listening to the -sound of the waves- without thinking. Those days are the best. --You can also say "Last but not least is the sea." It flows a little better.

That's hard. Only during this last year I've understood how much important is social life for me (and I want you to know that I'm such a shy and introverted person). So, probably without my close friends my life would be really boring. Another aspect may be to be in good health. You know, If you don't have any physical complication or problem you can do literally whatever you want. Nothing can stop you, except yourself. The last (but not least) thing is the sea. I don't know how to explain this, but I love so so much the sun, spending days by the seashore, listening to waves' sound without thinking. Those days are the best. --- Maybe if you can help me to find different ways to re-write these sentences it could be a great help, thanks!