My friend told that it's troublesome for just that amount of money(to actually buy when I get more and the price falls low again . But I am worried in case I lose this chance now, because who knows when btc will reach 600€ again? Years? Months? Never? Even if the prices goes to x2 I think it's a pretty good deal)
What do you think?
Your friend's probably right in the sense that the trouble needed to get verified on an exchange could be bothersome, depending on where you come from. Also, to scout for a good price for 50 EUR might be tough. Why? Because most types of exchanges take a flat fee plus percentage. It doesn't seem like a lot when buying hundreds or thousands of dollars worth, but if you have to pay a $5 fee to deposit your cash for the trade, you lose 10% immediately.
My suggestion: localbitcoins. Most sellers allow online payments, go for an escrow. You'll get your full 50 euros worth (at the trading price) and it costs very little to withdraw coins out of LBC to your own wallet.
BTW, I complete my first year of being in Bitcoin today. Exactly one year ago, it was around $600. Had I had bought $50 worth then, I'd have about $300 now.